This removes another use of the gl::ErrorOrResult pattern. Unblocks error refactoring. Bug: angleproject:2738 Change-Id: Ib611a3b68f8995469befd51797dfed34eaeee84e Reviewed-on: https://chromium-review.googlesource.com/1151450 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
