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

remoting/protocol/video_reader.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_reader.h"
 
 #include "remoting/protocol/session_config.h"
 #include "remoting/protocol/protobuf_video_reader.h"
 
 namespace remoting {
@@ skipping 10 matching lines @@
           new ProtobufVideoReader(VideoPacketFormat::ENCODING_VP8));
     } else if (video_config.codec == ChannelConfig::CODEC_ZIP) {
       return scoped_ptr<VideoReader>(
           new ProtobufVideoReader(VideoPacketFormat::ENCODING_ZLIB));
     } else if (video_config.codec == ChannelConfig::CODEC_VERBATIM) {
       return scoped_ptr<VideoReader>(
           new ProtobufVideoReader(VideoPacketFormat::ENCODING_VERBATIM));
     }
   }
   NOTREACHED();
-  return scoped_ptr<VideoReader>(NULL);
+  return scoped_ptr<VideoReader>();
 }
 
 }  // namespace protocol
 }  // namespace remoting