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Previously VideoRendererImpl waited for the VideoFrameStream::Reset() to
complete before invalidating its frame callback weak pointers, which
meant that it could receive frames that it didn't want between Flush()
and OnVideoFrameStreamResetDone(). For simplicity, now the weak pointers
are invalidated at the same time that Reset() is called, so it's
guaranteed that no frames will be received after Flush().

Also included in this change is reordering the deletion of the video
frame queue and resetting of the VideoFrameStream to save VDAs doing
wasted work.

BUG=640800

Review-Url: https://codereview.chromium.org/2273033003
Cr-Commit-Position: refs/heads/master@{#414285}