Adding PeerConnectionInterface::SetConfiguration method.

talk/app/webrtc/objc/public/RTCPeerConnection.h

Index: talk/app/webrtc/objc/public/RTCPeerConnection.h
diff --git a/talk/app/webrtc/objc/public/RTCPeerConnection.h b/talk/app/webrtc/objc/public/RTCPeerConnection.h
index 7177fd6c21f2693e06269183b9760f35592c9828..a13ed3ecc366ad33e0dc9882aca8934fadc3cb1d 100644
--- a/talk/app/webrtc/objc/public/RTCPeerConnection.h
+++ b/talk/app/webrtc/objc/public/RTCPeerConnection.h
@@ -27,6 +27,7 @@
 
 #import "RTCPeerConnectionDelegate.h"
 
+@class RTCConfiguration;
 @class RTCDataChannel;
 @class RTCDataChannelInit;
 @class RTCICECandidate;
@@ -97,10 +98,12 @@
     setRemoteDescriptionWithDelegate:(id<RTCSessionDescriptionDelegate>)delegate
                   sessionDescription:(RTCSessionDescription *)sdp;
 
-// Restarts or updates the ICE Agent process of gathering local candidates
-// and pinging remote candidates.
-- (BOOL)updateICEServers:(NSArray *)servers
-             constraints:(RTCMediaConstraints *)constraints;
+// 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;
 
 // Provides a remote candidate to the ICE Agent.
 - (BOOL)addICECandidate:(RTCICECandidate *)candidate;