EDK: Convert remaining scoped_ptr -> std::unique_ptr in //mojo/edk/system.

mojo/edk/system/incoming_endpoint.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/edk/system/incoming_endpoint.h"
 
 #include "base/logging.h"
 #include "mojo/edk/system/channel_endpoint.h"
 #include "mojo/edk/system/data_pipe.h"
 #include "mojo/edk/system/message_in_transit.h"
@@ skipping 49 matching lines @@
     endpoint_ = nullptr;
   }
 }
 
 bool IncomingEndpoint::OnReadMessage(unsigned /*port*/,
                                      MessageInTransit* message) {
   MutexLocker locker(&mutex_);
   if (!endpoint_)
     return false;
 
-  message_queue_.AddMessage(make_scoped_ptr(message));
+  message_queue_.AddMessage(std::unique_ptr<MessageInTransit>(message));
   return true;
 }
 
 void IncomingEndpoint::OnDetachFromChannel(unsigned /*port*/) {
   Close();
 }
 
 IncomingEndpoint::~IncomingEndpoint() {
 }
 
 }  // namespace system
 }  // namespace mojo