Removed the last of the GL function calls from GC3D

Refactored all WebGL objects to use WGC3D instead

BUG=326382
R=adamk@chromium.org, kbr@chromium.org

Review URL: https://codereview.chromium.org/137853002

git-svn-id: svn://svn.chromium.org/blink/trunk@165325 bbb929c8-8fbe-4397-9dbb-9b2b20218538