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Using an RGBA8 image for an RG8 texture was causing confusion in the
underlying driver where copyTexSubImage could be disallowed because
of unequal formats between the framebuffer and texture (RG8 vs RGBA8)
while the application was seeing 2 RGBA8 textures. Removing the
workaround is now possible and fixes the issue.

Bug: 985458
Change-Id: I6a1ac80f05adb67917ddda34835c9be7f0d5d1ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2499264Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Commit-Queue: Alexis Hétu <sugoi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820905}