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Previously WebMediaPlayerMS::FrameDeliverer was keeping pointers to the
original frames passed to GpuMemoryBufferVideoFramePool in order to detect
when the original frame is returned back. This change updates it to use
VideoFrame::unique_id(), which allows to avoid adding ref count for the
frame.

Change-Id: I5186d9709debecaccc768f485de3233dde906b18
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2333568
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794206}