GitLab

Had to move from content/gpu to content/common/gpu to allow gpu_video_service.cc
to depend on the decoder.
Removed some dead code and did some random cleanup while I was in there.

BUG=none
TEST=chrome compiles on cros/arm!

Review URL: http://codereview.chromium.org/7057027

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@86681 0039d316-1c4b-4281-b951-d872f2087c98