Updated GC3D typedefs to use their standard GL counterparts.

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

Review URL: https://codereview.chromium.org/99133014

git-svn-id: svn://svn.chromium.org/blink/trunk@163820 bbb929c8-8fbe-4397-9dbb-9b2b20218538