Revert 256126 "Added pixel test that ensures WebGL content can r..."
> Added pixel test that ensures WebGL content can render properly after a context loss and restore.
>
> Tests a regression introduced by http://src.chromium.org/viewvc/blink?revision=167860&view=revision
>
> BUG=349195
>
> Review URL: https://codereview.chromium.org/
188073002
TBR=bajones@chromium.org
Review URL: https://codereview.chromium.org/
195393002
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256258 0039d316-1c4b-4281-b951-d872f2087c98