Switch ui/gl/gl_enums.cc from khronos GL to ui/gl

gl_enums used Khronos to get a definition of GL_NONE but
that broke jumbo build experiments because you cannot have
khronos headers and ui/gl headers in the same translation
unit.

This patch switches gl_enums.cc to use ui/gl/gl_bindings.h like
the rest of the code.

Bug: 864986
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: Id239ca4aa55278ac012c066d6a6f8e243b3ec319
Reviewed-on: https://chromium-review.googlesource.com/1148442
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#577799}
1 file changed