Revert 238758 "Pull down webgl conformance tests from github mir..."

Due to licence issues. Will investigate and reland later.

> Pull down webgl conformance tests from github mirror.
> 
> BUG=325505
> TEST=gpu waterfall
> R=bajones@chromium.org, brettw@chromium.org, kbr@chromium.org
> 
> Review URL: https://codereview.chromium.org/100413002

TBR=zmo@chromium.org

Review URL: https://codereview.chromium.org/104723003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238786 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238786
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238787 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238787