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

webrtc/api/objc/RTCDataChannel.mm

 /*
  *  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 "RTCDataChannel.h"
 
 #import "webrtc/api/objc/RTCDataChannel+Private.h"
 #import "webrtc/base/objc/NSString+StdString.h"
 
+#include "webrtc/base/scoped_ptr.h"
+
 namespace webrtc {
 
 class DataChannelDelegateAdapter : public DataChannelObserver {
  public:
   DataChannelDelegateAdapter(RTCDataChannel *channel) { channel_ = channel; }
 
   void OnStateChange() override {
     [channel_.delegate dataChannelDidChangeState:channel_];
   }
 
@@ skipping 186 matching lines @@
     case RTCDataChannelStateOpen:
       return @"Open";
     case RTCDataChannelStateClosing:
       return @"Closing";
     case RTCDataChannelStateClosed:
       return @"Closed";
   }
 }
 
 @end