GitLab

Make sure that there is no pending change resolution
after the last buffer is received.

BUG=b:161904111
TEST=seek test starting to pass on trogdor

Change-Id: I7e01216d3f24f19d097d72c99a4f2ed8598c5f91
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2382950Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Commit-Queue: Fritz Koenig <frkoenig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805758}