Replace scoped_ptr with unique_ptr in webrtc/base/

webrtc/base/messagehandler.h

 /*
  *  Copyright 2004 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.
  */
 
 #ifndef WEBRTC_BASE_MESSAGEHANDLER_H_
 #define WEBRTC_BASE_MESSAGEHANDLER_H_
 
+#include <memory>
 #include <utility>
 
 #include "webrtc/base/constructormagic.h"
 #include "webrtc/base/scoped_ptr.h"
 
 namespace rtc {
 
 struct Message;
 
 // Messages get dispatched to a MessageHandler
@@ skipping 51 matching lines @@
   }
   void result() const {}
 
  private:
   FunctorT functor_;
 };
 
 } // namespace rtc
 
 #endif // WEBRTC_BASE_MESSAGEHANDLER_H_