Rewrite scoped_ptr<T>(NULL) to use the default ctor in remoting/.

remoting/protocol/video_writer.cc

 // Copyright (c) 2012 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 "remoting/protocol/video_writer.h"
 
 #include "remoting/protocol/session_config.h"
 #include "remoting/protocol/protobuf_video_writer.h"
 
 namespace remoting {
 namespace protocol {
 
 VideoWriter::~VideoWriter() { }
 
 // static
 scoped_ptr<VideoWriter> VideoWriter::Create(const SessionConfig& config) {
   const ChannelConfig& video_config = config.video_config();
   if (video_config.transport == ChannelConfig::TRANSPORT_STREAM) {
     return scoped_ptr<VideoWriter>(new ProtobufVideoWriter());
   }
-  return scoped_ptr<VideoWriter>(NULL);
+  return scoped_ptr<VideoWriter>();
 }
 
 }  // namespace protocol
 }  // namespace remoting