Revert "Add SSLConfig object to IceServer."

This reverts commit 7f1ffcccce563a086da037334aec2d4faa723edb.

Reason for revert: Speculative revert

Original change's description:
> Add SSLConfig object to IceServer.
> 
> This is being added to allow greater configurability to TLS connections.
> tlsAlpnProtocols, tlsEllipticCurves and tlsCertPolicy will be removed from IceServer in a
> follow-up CL.
> 
> Bug: webrtc:9662
> Change-Id: I33cb804b02c26c662ed2a28c76f9a9dc2df40f36
> Reviewed-on: https://webrtc-review.googlesource.com/96020
> Commit-Queue: Diogo Real <diogor@google.com>
> Reviewed-by: Qingsi Wang <qingsi@webrtc.org>
> Reviewed-by: Benjamin Wright <benwright@webrtc.org>
> Reviewed-by: Steve Anton <steveanton@webrtc.org>
> Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
> Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#24559}

TBR=steveanton@webrtc.org,sakal@webrtc.org,kthelgason@webrtc.org,juberti@webrtc.org,emadomara@webrtc.org,qingsi@webrtc.org,benwright@webrtc.org,diogor@google.com

Change-Id: Iae9fc68b77f743876bda36fc2a04f6d791aae8e2
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:9662
Reviewed-on: https://webrtc-review.googlesource.com/98000
Reviewed-by: Ying Wang <yinwa@webrtc.org>
Commit-Queue: Ying Wang <yinwa@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24563}
diff --git a/sdk/objc/api/peerconnection/RTCIceServer.h b/sdk/objc/api/peerconnection/RTCIceServer.h
index a9760c7..c2def04 100644
--- a/sdk/objc/api/peerconnection/RTCIceServer.h
+++ b/sdk/objc/api/peerconnection/RTCIceServer.h
@@ -11,7 +11,11 @@
 #import <Foundation/Foundation.h>
 
 #import "RTCMacros.h"
-#import "RTCSSLConfig.h"
+
+typedef NS_ENUM(NSUInteger, RTCTlsCertPolicy) {
+  RTCTlsCertPolicySecure,
+  RTCTlsCertPolicyInsecureNoCheck
+};
 
 NS_ASSUME_NONNULL_BEGIN
 
@@ -28,8 +32,7 @@
 @property(nonatomic, readonly, nullable) NSString *credential;
 
 /**
-  Deprecated. TODO(diogor, webrtc:9673): Remove from API.
-  TLS certificate policy to use if this RTCIceServer object is a TURN server.
+ * TLS certificate policy to use if this RTCIceServer object is a TURN server.
  */
 @property(nonatomic, readonly) RTCTlsCertPolicy tlsCertPolicy;
 
@@ -40,24 +43,15 @@
  */
 @property(nonatomic, readonly, nullable) NSString *hostname;
 
-/**
-  Deprecated. TODO(diogor, webrtc:9673): Remove from API.
-  List of protocols to be used in the TLS ALPN extension.
-  This field will be ignored if also set in RTCSSLConfig.
- */
+/** List of protocols to be used in the TLS ALPN extension. */
 @property(nonatomic, readonly) NSArray<NSString *> *tlsAlpnProtocols;
 
 /**
-  Deprecated. TODO(diogor, webrtc:9673): Remove from API.
   List elliptic curves to be used in the TLS elliptic curves extension.
   Only curve names supported by OpenSSL should be used (eg. "P-256","X25519").
-  This field will be ignored if also set in RTCSSLConfig.
   */
 @property(nonatomic, readonly) NSArray<NSString *> *tlsEllipticCurves;
 
-/** SSL configuration options for any SSL/TLS connections to this IceServer. */
-@property(nonatomic, readonly) RTCSSLConfig *sslConfig;
-
 - (nonnull instancetype)init NS_UNAVAILABLE;
 
 /** Convenience initializer for a server with no authentication (e.g. STUN). */
@@ -112,17 +106,8 @@
                      tlsCertPolicy:(RTCTlsCertPolicy)tlsCertPolicy
                           hostname:(nullable NSString *)hostname
                   tlsAlpnProtocols:(nullable NSArray<NSString *> *)tlsAlpnProtocols
-                 tlsEllipticCurves:(nullable NSArray<NSString *> *)tlsEllipticCurves;
-
-/**
- * Initialize an RTCIceServer with its associated URLs, optional
- * username, optional credential, hostname and SSL config.
- */
-- (instancetype)initWithURLStrings:(NSArray<NSString *> *)urlStrings
-                          username:(nullable NSString *)username
-                        credential:(nullable NSString *)credential
-                          hostname:(nullable NSString *)hostname
-                         sslConfig:(RTCSSLConfig *)sslConfig NS_DESIGNATED_INITIALIZER;
+                 tlsEllipticCurves:(nullable NSArray<NSString *> *)tlsEllipticCurves
+    NS_DESIGNATED_INITIALIZER;
 
 @end
 
diff --git a/sdk/objc/api/peerconnection/RTCIceServer.mm b/sdk/objc/api/peerconnection/RTCIceServer.mm
index 1e0d170..2138e4c 100644
--- a/sdk/objc/api/peerconnection/RTCIceServer.mm
+++ b/sdk/objc/api/peerconnection/RTCIceServer.mm
@@ -9,7 +9,6 @@
  */
 
 #import "RTCIceServer+Private.h"
-#import "RTCSSLConfig+Native.h"
 
 #import "helpers/NSString+StdString.h"
 
@@ -22,7 +21,6 @@
 @synthesize hostname = _hostname;
 @synthesize tlsAlpnProtocols = _tlsAlpnProtocols;
 @synthesize tlsEllipticCurves = _tlsEllipticCurves;
-@synthesize sslConfig = _sslConfig;
 
 - (instancetype)initWithURLStrings:(NSArray<NSString *> *)urlStrings {
   return [self initWithURLStrings:urlStrings
@@ -85,40 +83,28 @@
                           hostname:(NSString *)hostname
                   tlsAlpnProtocols:(NSArray<NSString *> *)tlsAlpnProtocols
                  tlsEllipticCurves:(NSArray<NSString *> *)tlsEllipticCurves {
-  RTCSSLConfig *sslConfig = [[RTCSSLConfig alloc] init];
-  sslConfig.tlsCertPolicy = tlsCertPolicy;
-  sslConfig.tlsALPNProtocols = [[NSArray alloc] initWithArray:tlsAlpnProtocols copyItems:YES];
-  sslConfig.tlsEllipticCurves = [[NSArray alloc] initWithArray:tlsEllipticCurves copyItems:YES];
-  return [self initWithURLStrings:urlStrings
-                         username:username
-                       credential:credential
-                         hostname:hostname
-                        sslConfig:sslConfig];
-}
-
-- (instancetype)initWithURLStrings:(NSArray<NSString *> *)urlStrings
-                          username:(NSString *)username
-                        credential:(NSString *)credential
-                          hostname:(NSString *)hostname
-                         sslConfig:(RTCSSLConfig *)sslConfig {
   NSParameterAssert(urlStrings.count);
   if (self = [super init]) {
     _urlStrings = [[NSArray alloc] initWithArray:urlStrings copyItems:YES];
     _username = [username copy];
     _credential = [credential copy];
+    _tlsCertPolicy = tlsCertPolicy;
     _hostname = [hostname copy];
-    _sslConfig = sslConfig;
+    _tlsAlpnProtocols = [[NSArray alloc] initWithArray:tlsAlpnProtocols copyItems:YES];
+    _tlsEllipticCurves = [[NSArray alloc] initWithArray:tlsEllipticCurves copyItems:YES];
   }
   return self;
 }
 
 - (NSString *)description {
-  return [NSString stringWithFormat:@"RTCIceServer:\n%@\n%@\n%@\n%@\n%@",
+  return [NSString stringWithFormat:@"RTCIceServer:\n%@\n%@\n%@\n%@\n%@\n%@\n%@",
                                     _urlStrings,
                                     _username,
                                     _credential,
+                                    [self stringForTlsCertPolicy:_tlsCertPolicy],
                                     _hostname,
-                                    _sslConfig];
+                                    _tlsAlpnProtocols,
+                                    _tlsEllipticCurves];
 }
 
 #pragma mark - Private
@@ -163,8 +149,6 @@
           webrtc::PeerConnectionInterface::kTlsCertPolicyInsecureNoCheck;
       break;
   }
-
-  iceServer.ssl_config = [_sslConfig nativeConfig];
   return iceServer;
 }
 
@@ -178,38 +162,34 @@
   NSString *username = [NSString stringForStdString:nativeServer.username];
   NSString *credential = [NSString stringForStdString:nativeServer.password];
   NSString *hostname = [NSString stringForStdString:nativeServer.hostname];
-  RTCSSLConfig *sslConfig = [[RTCSSLConfig alloc] initWithNativeConfig:nativeServer.ssl_config];
-
-  if (!nativeServer.ssl_config.tls_alpn_protocols.has_value() &&
-      !nativeServer.tls_alpn_protocols.empty()) {
-    NSMutableArray *tlsALPNProtocols =
-        [NSMutableArray arrayWithCapacity:nativeServer.tls_alpn_protocols.size()];
-    for (auto const &proto : nativeServer.tls_alpn_protocols) {
-      [tlsALPNProtocols addObject:[NSString stringForStdString:proto]];
-    }
-    sslConfig.tlsALPNProtocols = tlsALPNProtocols;
+  NSMutableArray *tlsAlpnProtocols =
+      [NSMutableArray arrayWithCapacity:nativeServer.tls_alpn_protocols.size()];
+  for (auto const &proto : nativeServer.tls_alpn_protocols) {
+    [tlsAlpnProtocols addObject:[NSString stringForStdString:proto]];
   }
-
-  if (!nativeServer.ssl_config.tls_elliptic_curves.has_value() &&
-      !nativeServer.tls_elliptic_curves.empty()) {
-    NSMutableArray *tlsEllipticCurves =
-        [NSMutableArray arrayWithCapacity:nativeServer.tls_elliptic_curves.size()];
-    for (auto const &curve : nativeServer.tls_elliptic_curves) {
-      [tlsEllipticCurves addObject:[NSString stringForStdString:curve]];
-    }
-    sslConfig.tlsEllipticCurves = tlsEllipticCurves;
+  NSMutableArray *tlsEllipticCurves =
+      [NSMutableArray arrayWithCapacity:nativeServer.tls_elliptic_curves.size()];
+  for (auto const &curve : nativeServer.tls_elliptic_curves) {
+    [tlsEllipticCurves addObject:[NSString stringForStdString:curve]];
   }
+  RTCTlsCertPolicy tlsCertPolicy;
 
-  if (nativeServer.tls_cert_policy ==
-      webrtc::PeerConnectionInterface::kTlsCertPolicyInsecureNoCheck) {
-    sslConfig.tlsCertPolicy = RTCTlsCertPolicyInsecureNoCheck;
+  switch (nativeServer.tls_cert_policy) {
+    case webrtc::PeerConnectionInterface::kTlsCertPolicySecure:
+      tlsCertPolicy = RTCTlsCertPolicySecure;
+      break;
+    case webrtc::PeerConnectionInterface::kTlsCertPolicyInsecureNoCheck:
+      tlsCertPolicy = RTCTlsCertPolicyInsecureNoCheck;
+      break;
   }
 
   self = [self initWithURLStrings:urls
                          username:username
                        credential:credential
+                    tlsCertPolicy:tlsCertPolicy
                          hostname:hostname
-                        sslConfig:sslConfig];
+                 tlsAlpnProtocols:tlsAlpnProtocols
+                tlsEllipticCurves:tlsEllipticCurves];
   return self;
 }
 
diff --git a/sdk/objc/api/peerconnection/RTCSSLConfig+Native.h b/sdk/objc/api/peerconnection/RTCSSLConfig+Native.h
deleted file mode 100644
index 7a38edc..0000000
--- a/sdk/objc/api/peerconnection/RTCSSLConfig+Native.h
+++ /dev/null
@@ -1,27 +0,0 @@
-/*
- *  Copyright 2018 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#import "RTCSSLConfig.h"
-
-#include "api/peerconnectioninterface.h"
-#include "rtc_base/ssladapter.h"
-
-NS_ASSUME_NONNULL_BEGIN
-
-@interface RTCSSLConfig (Native)
-
-- (rtc::SSLConfig)nativeConfig;
-
-/** Initialize an RTCSSLConfig from a native SSLConfig. */
-- (instancetype)initWithNativeConfig:(const rtc::SSLConfig &)config;
-
-@end
-
-NS_ASSUME_NONNULL_END
diff --git a/sdk/objc/api/peerconnection/RTCSSLConfig.h b/sdk/objc/api/peerconnection/RTCSSLConfig.h
deleted file mode 100644
index 5421609..0000000
--- a/sdk/objc/api/peerconnection/RTCSSLConfig.h
+++ /dev/null
@@ -1,56 +0,0 @@
-/*
- *  Copyright 2018 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#import <Foundation/Foundation.h>
-
-#import <WebRTC/RTCMacros.h>
-
-typedef NS_ENUM(NSUInteger, RTCTlsCertPolicy) {
-  RTCTlsCertPolicySecure,
-  RTCTlsCertPolicyInsecureNoCheck
-};
-
-NS_ASSUME_NONNULL_BEGIN
-
-RTC_EXPORT
-@interface RTCSSLConfig : NSObject
-
-/** Indicates whether to enable OCSP stapling in TLS. */
-@property(nonatomic) BOOL enableOCSPStapling;
-
-/** Indicates whether to enable the signed certificate timestamp extension in TLS. */
-@property(nonatomic) BOOL enableSignedCertTimestamp;
-
-/** Indicates whether to enable the TLS Channel ID extension. */
-@property(nonatomic) BOOL enableTlsChannelId;
-
-/** Indicates whether to enable the TLS GREASE extension. */
-@property(nonatomic) BOOL enableGrease;
-
-/** Indicates how to process TURN server certificates */
-@property(nonatomic) RTCTlsCertPolicy tlsCertPolicy;
-
-/** Highest supported SSL version, as defined in the supported_versions TLS extension. */
-@property(nonatomic, nullable) NSNumber *maxSSLVersion;
-
-/** List of protocols to be used in the TLS ALPN extension. */
-@property(nonatomic, copy, nullable) NSArray<NSString *> *tlsALPNProtocols;
-
-/**
- List of elliptic curves to be used in the TLS elliptic curves extension.
- Only curve names supported by OpenSSL should be used (eg. "P-256","X25519").
- */
-@property(nonatomic, copy, nullable) NSArray<NSString *> *tlsEllipticCurves;
-
-- (instancetype)init;
-
-@end
-
-NS_ASSUME_NONNULL_END
diff --git a/sdk/objc/api/peerconnection/RTCSSLConfig.mm b/sdk/objc/api/peerconnection/RTCSSLConfig.mm
deleted file mode 100644
index 60ff47c..0000000
--- a/sdk/objc/api/peerconnection/RTCSSLConfig.mm
+++ /dev/null
@@ -1,134 +0,0 @@
-/*
- *  Copyright 2018 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#import "RTCSSLConfig+Native.h"
-
-#import "helpers/NSString+StdString.h"
-
-@implementation RTCSSLConfig
-
-@synthesize enableOCSPStapling = _enableOCSPStapling;
-@synthesize enableSignedCertTimestamp = _enableSignedCertTimestamp;
-@synthesize enableTlsChannelId = _enableTlsChannelId;
-@synthesize enableGrease = _enableGrease;
-@synthesize tlsCertPolicy = _tlsCertPolicy;
-@synthesize maxSSLVersion = _maxSSLVersion;
-@synthesize tlsALPNProtocols = _tlsALPNProtocols;
-@synthesize tlsEllipticCurves = _tlsEllipticCurves;
-
-- (instancetype)init {
-  // Copy defaults
-  rtc::SSLConfig config;
-  return [self initWithNativeConfig:config];
-}
-
-- (instancetype)initWithNativeConfig:(const rtc::SSLConfig &)config {
-  if (self = [super init]) {
-    _enableOCSPStapling = config.enable_ocsp_stapling;
-    _enableSignedCertTimestamp = config.enable_signed_cert_timestamp;
-    _enableTlsChannelId = config.enable_tls_channel_id;
-    _enableGrease = config.enable_grease;
-
-    switch (config.tls_cert_policy) {
-      case rtc::TlsCertPolicy::TLS_CERT_POLICY_SECURE:
-        _tlsCertPolicy = RTCTlsCertPolicySecure;
-        break;
-      case rtc::TlsCertPolicy::TLS_CERT_POLICY_INSECURE_NO_CHECK:
-        _tlsCertPolicy = RTCTlsCertPolicyInsecureNoCheck;
-        break;
-    }
-
-    if (config.max_ssl_version) {
-      _maxSSLVersion = [NSNumber numberWithInt:*config.max_ssl_version];
-    }
-    if (config.tls_alpn_protocols) {
-      NSMutableArray *tlsALPNProtocols =
-          [NSMutableArray arrayWithCapacity:config.tls_alpn_protocols.value().size()];
-      for (auto const &proto : config.tls_alpn_protocols.value()) {
-        [tlsALPNProtocols addObject:[NSString stringForStdString:proto]];
-      }
-      _tlsALPNProtocols = tlsALPNProtocols;
-    }
-    if (config.tls_elliptic_curves) {
-      NSMutableArray *tlsEllipticCurves =
-          [NSMutableArray arrayWithCapacity:config.tls_elliptic_curves.value().size()];
-      for (auto const &curve : config.tls_elliptic_curves.value()) {
-        [tlsEllipticCurves addObject:[NSString stringForStdString:curve]];
-      }
-      _tlsEllipticCurves = tlsEllipticCurves;
-    }
-  }
-  return self;
-}
-
-- (NSString *)description {
-  return [NSString stringWithFormat:@"RTCSSLConfig:\n%d\n%d\n%d\n%d\n%@\n%@\n%@\n%@",
-                                    _enableOCSPStapling,
-                                    _enableSignedCertTimestamp,
-                                    _enableTlsChannelId,
-                                    _enableGrease,
-                                    [self stringForTlsCertPolicy:_tlsCertPolicy],
-                                    _maxSSLVersion,
-                                    _tlsALPNProtocols,
-                                    _tlsEllipticCurves];
-}
-
-#pragma mark - Private
-
-- (NSString *)stringForTlsCertPolicy:(RTCTlsCertPolicy)tlsCertPolicy {
-  switch (tlsCertPolicy) {
-    case RTCTlsCertPolicySecure:
-      return @"RTCTlsCertPolicySecure";
-    case RTCTlsCertPolicyInsecureNoCheck:
-      return @"RTCTlsCertPolicyInsecureNoCheck";
-  }
-}
-
-- (rtc::SSLConfig)nativeConfig {
-  __block rtc::SSLConfig sslConfig;
-
-  sslConfig.enable_ocsp_stapling = _enableOCSPStapling;
-  sslConfig.enable_signed_cert_timestamp = _enableSignedCertTimestamp;
-  sslConfig.enable_tls_channel_id = _enableTlsChannelId;
-  sslConfig.enable_grease = _enableGrease;
-
-  switch (_tlsCertPolicy) {
-    case RTCTlsCertPolicySecure:
-      sslConfig.tls_cert_policy = rtc::TlsCertPolicy::TLS_CERT_POLICY_SECURE;
-      break;
-    case RTCTlsCertPolicyInsecureNoCheck:
-      sslConfig.tls_cert_policy = rtc::TlsCertPolicy::TLS_CERT_POLICY_INSECURE_NO_CHECK;
-      break;
-  }
-
-  if (_maxSSLVersion != nil) {
-    sslConfig.max_ssl_version = absl::optional<int>(_maxSSLVersion.intValue);
-  }
-
-  if (_tlsALPNProtocols != nil) {
-    __block std::vector<std::string> alpn_protocols;
-    [_tlsALPNProtocols enumerateObjectsUsingBlock:^(NSString *proto, NSUInteger idx, BOOL *stop) {
-      alpn_protocols.push_back(proto.stdString);
-    }];
-    sslConfig.tls_alpn_protocols = absl::optional<std::vector<std::string>>(alpn_protocols);
-  }
-
-  if (_tlsEllipticCurves != nil) {
-    __block std::vector<std::string> elliptic_curves;
-    [_tlsEllipticCurves enumerateObjectsUsingBlock:^(NSString *curve, NSUInteger idx, BOOL *stop) {
-      elliptic_curves.push_back(curve.stdString);
-    }];
-    sslConfig.tls_elliptic_curves = absl::optional<std::vector<std::string>>(elliptic_curves);
-  }
-
-  return sslConfig;
-}
-
-@end