Revert BGRA renderability change for ES drivers. While these should be supported on ES drivers, ANGLE's texture format caps generation does not correctly differentiate between renderbuffer and framebuffer attachment formats and leads to assertion failures. BUG=779346 BUG=angleproject:1523 Change-Id: I9a49abdf52ae8b1ef91f88a4434ff8c3f95b025b Reviewed-on: https://chromium-review.googlesource.com/748888 Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Geoff Lang <geofflang@chromium.org>