Move a bunch of code in content\common (as well as a few left in renderer) to the content namespace.

content/common/gpu/client/gpu_video_decode_accelerator_host.h

 // 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.
 
 #ifndef CONTENT_COMMON_GPU_CLIENT_GPU_VIDEO_DECODE_ACCELERATOR_HOST_H_
 #define CONTENT_COMMON_GPU_CLIENT_GPU_VIDEO_DECODE_ACCELERATOR_HOST_H_
 
 #include <vector>
 
 #include "base/memory/weak_ptr.h"
 #include "base/threading/non_thread_safe.h"
 #include "ipc/ipc_listener.h"
 #include "media/video/video_decode_accelerator.h"
 
+namespace content {
 class GpuChannelHost;
 
 // This class is used to talk to VideoDecodeAccelerator in the Gpu process
 // through IPC messages.
 class GpuVideoDecodeAcceleratorHost
     : public IPC::Listener,
       public media::VideoDecodeAccelerator,
       public base::NonThreadSafe {
  public:
   // |channel| is used to send IPC messages to GPU process.
@@ skipping 39 matching lines @@
   // process is vulnerable to GPU process crashing & being respawned, and
   // attempting to use an outdated or reused route id.
   int32 decoder_route_id_;
 
   // Reference to the client that will receive callbacks from the decoder.
   media::VideoDecodeAccelerator::Client* client_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuVideoDecodeAcceleratorHost);
 };
 
+}  // namespace content
+
 #endif  // CONTENT_COMMON_GPU_CLIENT_GPU_VIDEO_DECODE_ACCELERATOR_HOST_H_