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https://crrev.com/c/2626100 added RG_16EXT as a viz::ResourceFormat, and
accidentally marked it as a supported GpuMemoryBuffer format too.  This
causes crashes on ChromeOS when playing VP9.2 HDR video.

Bug: 1116101, b/177910735
Change-Id: Iaed4ffefa42bcca4b6bd1885d7e090d9f2782b45
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2639578
Auto-Submit: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: kylechar <kylechar@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845342}