rtc::Buffer: Replace an internal rtc::scoped_ptr with std::unique_ptr

talk/app/webrtc/objc/RTCDataChannel.mm

 /*
  * libjingle
  * Copyright 2014 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 14 matching lines @@
  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 #import "RTCDataChannel+Internal.h"
 
 #include "webrtc/api/datachannelinterface.h"
+#include "webrtc/base/scoped_ptr.h"
 
 namespace webrtc {
 
 class RTCDataChannelObserver : public DataChannelObserver {
  public:
   RTCDataChannelObserver(RTCDataChannel* channel) { _channel = channel; }
 
   void OnStateChange() override {
     [_channel.delegate channelDidChangeState:_channel];
   }
@@ skipping 236 matching lines @@
     _observer.reset(new webrtc::RTCDataChannelObserver(self));
   }
   return self;
 }
 
 - (rtc::scoped_refptr<webrtc::DataChannelInterface>)dataChannel {
   return _dataChannel;
 }
 
 @end