Build dynamic iOS SDK.

- Places most ObjC code into webrtc/sdk/objc instead.
- New gyp targets to build, strip and export symbols for dylib.
- Removes old script used to generate dylib.

BUG=

Review URL: https://codereview.webrtc.org/1903663002

Cr-Commit-Position: refs/heads/master@{#12524}
diff --git a/webrtc/sdk/objc/Framework/Classes/RTCDataChannelConfiguration.mm b/webrtc/sdk/objc/Framework/Classes/RTCDataChannelConfiguration.mm
new file mode 100644
index 0000000..89c56de
--- /dev/null
+++ b/webrtc/sdk/objc/Framework/Classes/RTCDataChannelConfiguration.mm
@@ -0,0 +1,83 @@
+/*
+ *  Copyright 2015 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 "RTCDataChannelConfiguration+Private.h"
+
+#import "NSString+StdString.h"
+
+@implementation RTCDataChannelConfiguration
+
+@synthesize nativeDataChannelInit = _nativeDataChannelInit;
+
+- (BOOL)isOrdered {
+  return _nativeDataChannelInit.ordered;
+}
+
+- (void)setIsOrdered:(BOOL)isOrdered {
+  _nativeDataChannelInit.ordered = isOrdered;
+}
+
+- (NSInteger)maxRetransmitTimeMs {
+  return self.maxPacketLifeTime;
+}
+
+- (void)setMaxRetransmitTimeMs:(NSInteger)maxRetransmitTimeMs {
+  self.maxPacketLifeTime = maxRetransmitTimeMs;
+}
+
+- (int)maxPacketLifeTime {
+  return _nativeDataChannelInit.maxRetransmitTime;
+}
+
+- (void)setMaxPacketLifeTime:(int)maxPacketLifeTime {
+  _nativeDataChannelInit.maxRetransmitTime = maxPacketLifeTime;
+}
+
+- (int)maxRetransmits {
+  return _nativeDataChannelInit.maxRetransmits;
+}
+
+- (void)setMaxRetransmits:(int)maxRetransmits {
+  _nativeDataChannelInit.maxRetransmits = maxRetransmits;
+}
+
+- (NSString *)protocol {
+  return [NSString stringForStdString:_nativeDataChannelInit.protocol];
+}
+
+- (void)setProtocol:(NSString *)protocol {
+  _nativeDataChannelInit.protocol = [NSString stdStringForString:protocol];
+}
+
+- (BOOL)isNegotiated {
+  return _nativeDataChannelInit.negotiated;
+}
+
+- (void)setIsNegotiated:(BOOL)isNegotiated {
+  _nativeDataChannelInit.negotiated = isNegotiated;
+}
+
+- (int)streamId {
+  return self.channelId;
+}
+
+- (void)setStreamId:(int)streamId {
+  self.channelId = streamId;
+}
+
+- (int)channelId {
+  return _nativeDataChannelInit.id;
+}
+
+- (void)setChannelId:(int)channelId {
+  _nativeDataChannelInit.id = channelId;
+}
+
+@end