Minor ObjC API tweaks.

webrtc/api/objc/RTCPeerConnection.h

 /*
  *  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.
  */
 
@@ skipping 111 matching lines @@
 - (instancetype)initWithFactory:
     (RTCPeerConnectionFactory *)factory
                   configuration:
     (RTCConfiguration *)configuration
                     constraints:
     (RTCMediaConstraints *)constraints
                        delegate:
     (nullable id<RTCPeerConnectionDelegate>)delegate
     NS_DESIGNATED_INITIALIZER;
 
+/** Sets the PeerConnection's global configuration to |configuration|.
+ *  Any changes to STUN/TURN servers or ICE candidate policy will affect the
+ *  next gathering phase, and cause the next call to createOffer to generate
+ *  new ICE credentials. Note that the BUNDLE and RTCP-multiplexing policies
+ *  cannot be changed with this method.
+ */
+- (BOOL)setConfiguration:(RTCConfiguration *)configuration;
+
 /** Terminate all media and close the transport. */
 - (void)close;
 
 /** Provide a remote candidate to the ICE Agent. */
 - (void)addIceCandidate:(RTCIceCandidate *)candidate;
 
 /** Add a new media stream to be sent on this peer connection. */
 - (void)addStream:(RTCMediaStream *)stream;
 
 /** Remove the given media stream from this peer connection. */
@@ skipping 38 matching lines @@
  */
 - (void)statsForTrack:
     (nullable RTCMediaStreamTrack *)mediaStreamTrack
      statsOutputLevel:(RTCStatsOutputLevel)statsOutputLevel
     completionHandler:
     (nullable void (^)(NSArray<RTCStatsReport *> *stats))completionHandler;
 
 @end
 
 NS_ASSUME_NONNULL_END