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We invalidated the callback we give to MediaCodecBridge for asynchronous
API callbacks during MCVD::Destroy(), so we never get notified when the
EOS we queued as input completes. Thus leaking VP8 players continuously!

We could change to not invalidating the WeakPtr for the asynchronous
callback, but since draining is for a KitKat era issue, lets drop the
drain entirely when using the asynchrous API (N+).

BUG=1006092
TEST=vp8 instances are no longer leaked.
R=liberato

Change-Id: I3ea9c6013686000f176891eb8e645a60430adc71
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1906116
Auto-Submit: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714033}