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This CL makes a small change to the VaapiVideoDecoder to not set the decoder
thread's task runner and call set_parent_task_runner() on the video frame pool
upon re-initialization. They are redundant and cause an assert in the video
frame pool when executing in debug mode.

TEST=./video_decode_accelerator_tests --use_vd on eve

BUG=976507

Change-Id: Idb3712e5d835c4aa122ce7bc9f7efd2dd99600a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1686666
Commit-Queue: David Staessens <dstaessens@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Chih-Yu Huang <akahuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683913}