Remove deprecated functions.

talk/app/webrtc/objc/RTCICECandidate.mm

 /*
  * libjingle
  * Copyright 2013 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 62 matching lines @@
     } else {
       self = nil;
       NSAssert(NO, @"ICECandidateInterface->ToString failed");
     }
   }
   return self;
 }
 
 - (const webrtc::IceCandidateInterface*)candidate {
   return webrtc::CreateIceCandidate(
-      [self.sdpMid UTF8String], self.sdpMLineIndex, [self.sdp UTF8String]);
+      [self.sdpMid UTF8String], self.sdpMLineIndex, [self.sdp UTF8String],
+      nullptr);
 }
 
 @end