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 33 matching lines @@
  public:
   explicit FunctorMessageHandler(const FunctorT& functor) : functor_(functor) {}
   virtual void OnMessage(Message* msg) { result_ = std::move(functor_()); }
   rtc::scoped_ptr<ReturnT> result() { return std::move(result_); }
 
  private:
   FunctorT functor_;
   rtc::scoped_ptr<ReturnT> result_;
 };
 
+// Specialization for std::unique_ptr<ReturnT>.
+template <class ReturnT, class FunctorT>
+class FunctorMessageHandler<class std::unique_ptr<ReturnT>, FunctorT>
+    : public MessageHandler {
+ public:
+  explicit FunctorMessageHandler(const FunctorT& functor) : functor_(functor) {}
+  virtual void OnMessage(Message* msg) { result_ = std::move(functor_()); }
+  std::unique_ptr<ReturnT> result() { return std::move(result_); }
+
+ private:
+  FunctorT functor_;
+  std::unique_ptr<ReturnT> result_;
+};
+
 // Specialization for ReturnT of void.
 template <class FunctorT>
 class FunctorMessageHandler<void, FunctorT> : public MessageHandler {
  public:
   explicit FunctorMessageHandler(const FunctorT& functor)
       : functor_(functor) {}
   virtual void OnMessage(Message* msg) {
     functor_();
   }
   void result() const {}
 
  private:
   FunctorT functor_;
 };
 
 } // namespace rtc
 
 #endif // WEBRTC_BASE_MESSAGEHANDLER_H_