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This removes the usage of Ozone directly in PlatformVideoFramePool via
the associated util file. This will allow for unit testing of more
code since the whole Ozone dependency will not be dragged into this code
and we can mock out the GpuMemoryBufferFactory instead.

Bug: 1007487
Test: Unit tests, video_decode_accelerator_test --use_vd,
video_encode_accelerator_unittest and image_processor_test (same results
as ToT for both), YT playback on nocturne

Change-Id: Iabed106319ace56096a34189b9c8986a03d80653
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1827888Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: David Staessens <dstaessens@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Chih-Yu Huang <akahuang@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Jeffrey Kardatzke <jkardatzke@google.com>
Cr-Commit-Position: refs/heads/master@{#703849}