Obj-C SDK Cleanup

This CL separates the files under sdk/objc into logical directories, replacing
the previous file layout under Framework/.

A long term goal is to have some system set up to generate the files under
sdk/objc/api (the PeerConnection API wrappers) from the C++ code. In the shorter
term the goal is to abstract out shared concepts from these classes in order to
make them as uniform as possible.

The separation into base/, components/, and helpers/ are to differentiate between
the base layer's common protocols, various utilities and the actual platform
specific components.

The old directory layout that resembled a framework's internal layout is not
necessary, since it is generated by the framework target when building it.

Bug: webrtc:9627
Change-Id: Ib084fd83f050ae980649ca99e841f4fb0580bd8f
Reviewed-on: https://webrtc-review.googlesource.com/94142
Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Reviewed-by: Henrik Andreassson <henrika@webrtc.org>
Commit-Queue: Anders Carlsson <andersc@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24493}
diff --git a/sdk/objc/Framework/Headers/WebRTC/RTCIceServer.h b/sdk/objc/Framework/Headers/WebRTC/RTCIceServer.h
index 727da8a..967b19c 100644
--- a/sdk/objc/Framework/Headers/WebRTC/RTCIceServer.h
+++ b/sdk/objc/Framework/Headers/WebRTC/RTCIceServer.h
@@ -8,107 +8,4 @@
  *  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 RTCIceServer : NSObject
-
-/** URI(s) for this server represented as NSStrings. */
-@property(nonatomic, readonly) NSArray<NSString *> *urlStrings;
-
-/** Username to use if this RTCIceServer object is a TURN server. */
-@property(nonatomic, readonly, nullable) NSString *username;
-
-/** Credential to use if this RTCIceServer object is a TURN server. */
-@property(nonatomic, readonly, nullable) NSString *credential;
-
-/**
- * TLS certificate policy to use if this RTCIceServer object is a TURN server.
- */
-@property(nonatomic, readonly) RTCTlsCertPolicy tlsCertPolicy;
-
-/**
-  If the URIs in |urls| only contain IP addresses, this field can be used
-  to indicate the hostname, which may be necessary for TLS (using the SNI
-  extension). If |urls| itself contains the hostname, this isn't necessary.
- */
-@property(nonatomic, readonly, nullable) NSString *hostname;
-
-/** List of protocols to be used in the TLS ALPN extension. */
-@property(nonatomic, readonly) NSArray<NSString *> *tlsAlpnProtocols;
-
-/**
-  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").
-  */
-@property(nonatomic, readonly) NSArray<NSString *> *tlsEllipticCurves;
-
-- (nonnull instancetype)init NS_UNAVAILABLE;
-
-/** Convenience initializer for a server with no authentication (e.g. STUN). */
-- (instancetype)initWithURLStrings:(NSArray<NSString *> *)urlStrings;
-
-/**
- * Initialize an RTCIceServer with its associated URLs, optional username,
- * optional credential, and credentialType.
- */
-- (instancetype)initWithURLStrings:(NSArray<NSString *> *)urlStrings
-                          username:(nullable NSString *)username
-                        credential:(nullable NSString *)credential;
-
-/**
- * Initialize an RTCIceServer with its associated URLs, optional username,
- * optional credential, and TLS cert policy.
- */
-- (instancetype)initWithURLStrings:(NSArray<NSString *> *)urlStrings
-                          username:(nullable NSString *)username
-                        credential:(nullable NSString *)credential
-                     tlsCertPolicy:(RTCTlsCertPolicy)tlsCertPolicy;
-
-/**
- * Initialize an RTCIceServer with its associated URLs, optional username,
- * optional credential, TLS cert policy and hostname.
- */
-- (instancetype)initWithURLStrings:(NSArray<NSString *> *)urlStrings
-                          username:(nullable NSString *)username
-                        credential:(nullable NSString *)credential
-                     tlsCertPolicy:(RTCTlsCertPolicy)tlsCertPolicy
-                          hostname:(nullable NSString *)hostname;
-
-/**
- * Initialize an RTCIceServer with its associated URLs, optional username,
- * optional credential, TLS cert policy, hostname and ALPN protocols.
- */
-- (instancetype)initWithURLStrings:(NSArray<NSString *> *)urlStrings
-                          username:(nullable NSString *)username
-                        credential:(nullable NSString *)credential
-                     tlsCertPolicy:(RTCTlsCertPolicy)tlsCertPolicy
-                          hostname:(nullable NSString *)hostname
-                  tlsAlpnProtocols:(NSArray<NSString *> *)tlsAlpnProtocols;
-
-/**
- * Initialize an RTCIceServer with its associated URLs, optional username,
- * optional credential, TLS cert policy, hostname, ALPN protocols and
- * elliptic curves.
- */
-- (instancetype)initWithURLStrings:(NSArray<NSString *> *)urlStrings
-                          username:(nullable NSString *)username
-                        credential:(nullable NSString *)credential
-                     tlsCertPolicy:(RTCTlsCertPolicy)tlsCertPolicy
-                          hostname:(nullable NSString *)hostname
-                  tlsAlpnProtocols:(nullable NSArray<NSString *> *)tlsAlpnProtocols
-                 tlsEllipticCurves:(nullable NSArray<NSString *> *)tlsEllipticCurves
-    NS_DESIGNATED_INITIALIZER;
-
-@end
-
-NS_ASSUME_NONNULL_END
+#import "api/peerconnection/RTCIceServer.h"