These weren't needed in many places.

Also renames one FramebufferVk method.

Bug: angleproject:2455
Change-Id: Idb641094fa3e180a85f357533d86bd0b19db4ec8
Reviewed-on: https://chromium-review.googlesource.com/1024826Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Luc Ferron <lucferron@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>