Move a bunch of content\common code into the content namespace.

content/common/gpu/media/vaapi_video_decode_accelerator.h

Index: content/common/gpu/media/vaapi_video_decode_accelerator.h
===================================================================
--- content/common/gpu/media/vaapi_video_decode_accelerator.h	(revision 163460)
+++ content/common/gpu/media/vaapi_video_decode_accelerator.h	(working copy)
@@ -29,6 +29,8 @@
 #include "media/video/picture.h"
 #include "media/video/video_decode_accelerator.h"
 
+namespace content {
+
 // Class to provide video decode acceleration for Intel systems with hardware
 // support for it, and on which libva is available.
 // Decoding tasks are performed in a separate decoding thread.
@@ -199,7 +201,7 @@
   base::WeakPtr<Client> client_;
 
   base::Thread decoder_thread_;
-  content::VaapiH264Decoder decoder_;
+  VaapiH264Decoder decoder_;
 
   int num_frames_at_client_;
   int num_stream_bufs_at_decoder_;
@@ -214,4 +216,6 @@
   DISALLOW_COPY_AND_ASSIGN(VaapiVideoDecodeAccelerator);
 };
 
+}  // namespace content
+
 #endif  // CONTENT_COMMON_GPU_MEDIA_VAAPI_VIDEO_DECODE_ACCELERATOR_H_