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

content/common/gpu/media/omx_video_decode_accelerator.cc

Index: content/common/gpu/media/omx_video_decode_accelerator.cc
===================================================================
--- content/common/gpu/media/omx_video_decode_accelerator.cc	(revision 163460)
+++ content/common/gpu/media/omx_video_decode_accelerator.cc	(working copy)
@@ -14,6 +14,8 @@
 #include "media/base/bitstream_buffer.h"
 #include "media/video/picture.h"
 
+namespace content {
+
 // Helper typedef for input buffers.  This is used as the pAppPrivate field of
 // OMX_BUFFERHEADERTYPEs of input buffers, to point to the data associated with
 // them.
@@ -1254,3 +1256,5 @@
                         PLATFORM_FAILURE, false);
   return true;
 }
+
+}  // namespace content