Remove gl::ErrorOrResult. Bug: angleproject:2491 Change-Id: Ief728b9c50ee2e1925a9b286c52c8ccda6b14fd2 Reviewed-on: https://chromium-review.googlesource.com/c/1255646 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Yuly Novikov <ynovikov@google.com> Reviewed-by: Frank Henigman <fjhenigman@chromium.org>