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All callers set it to something consistent with the BufferFormat (i.e.
the value of gpu::InternalFormatForGpuMemoryBufferFormat), and so is
redundant. For GetInternalFormat, we can directly extract it from the
BufferFormat.

Bug: 900044
Change-Id: I5e135d60dedf3854fbc28a29abcc26054dd663f7
Reviewed-on: https://chromium-review.googlesource.com/c/1306993
Commit-Queue: Antoine Labour <piman@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604108}