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The UnwrapFrame() method is only used between PlatformVideoFramePool
and MailboxVideoFrameConverter implementation. It is not a general
method.

This CL moves the method from DmabufVideoFramePool interface to
PlatformVideoFramePool implementation.

BUG=b:136716638
TEST=run video_decode_accelerator_tests on kevin

Change-Id: Icfd5d99fb2319ec904e0d8c298572cb0af1031b4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1824500
Auto-Submit: Chih-Yu Huang <akahuang@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: Chih-Yu Huang <akahuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700068}