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Convert the remaining bits referencing the viz::mojom::Gpu and the
viz::mojom::GpuMemoryBufferFactory mojo interfaces using the old
APIs to the new mojo types.

TBR=kinuko@chromium.org

Bug: 955171
Change-Id: Ib210e455a9642803d6414e6daf42756eb929e0e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1876350
Commit-Queue: Mario Sanchez Prada <mario@igalia.com>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: enne <enne@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709421}