Cleanup usage of scoped_ptr<> in remoting for C++11

remoting/codec/video_decoder_vpx.cc

 // Copyright 2013 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/codec/video_decoder_vpx.h"
 
 #include <math.h>
 
 #include <algorithm>
 
@@ skipping 38 matching lines @@
   // TODO(hclam): Scale the number of threads with number of cores of the
   // machine.
   vpx_codec_dec_cfg config;
   config.w = 0;
   config.h = 0;
   config.threads = 2;
   vpx_codec_err_t ret =
       vpx_codec_dec_init(codec.get(), vpx_codec_vp8_dx(), &config, 0);
   if (ret != VPX_CODEC_OK) {
     LOG(ERROR) << "Cannot initialize codec.";
-    return scoped_ptr<VideoDecoderVpx>();
+    return nullptr;
   }
 
   return scoped_ptr<VideoDecoderVpx>(new VideoDecoderVpx(codec.Pass()));
 }
 
 // static
 scoped_ptr<VideoDecoderVpx> VideoDecoderVpx::CreateForVP9() {
   ScopedVpxCodec codec(new vpx_codec_ctx_t);
 
   // TODO(hclam): Scale the number of threads with number of cores of the
   // machine.
   vpx_codec_dec_cfg config;
   config.w = 0;
   config.h = 0;
   config.threads = 2;
   vpx_codec_err_t ret =
       vpx_codec_dec_init(codec.get(), vpx_codec_vp9_dx(), &config, 0);
   if (ret != VPX_CODEC_OK) {
     LOG(ERROR) << "Cannot initialize codec.";
-    return scoped_ptr<VideoDecoderVpx>();
+    return nullptr;
   }
 
   return scoped_ptr<VideoDecoderVpx>(new VideoDecoderVpx(codec.Pass()));
 }
 
 VideoDecoderVpx::~VideoDecoderVpx() {}
 
 void VideoDecoderVpx::Initialize(const webrtc::DesktopSize& screen_size) {
   DCHECK(!screen_size.is_empty());
 
@@ skipping 256 matching lines @@
   webrtc::DesktopRegion difference = *new_desktop_shape;
   difference.Subtract(desktop_shape_);
   updated_region_.AddRegion(difference);
   updated_region_.IntersectWith(*new_desktop_shape);
 
   // Set the new desktop shape region.
   desktop_shape_.Swap(new_desktop_shape);
 }
 
 }  // namespace remoting