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This reverts commit 173e2342.

Reason for revert: Suspicious about causing failures at:
https://ci.chromium.org/p/chromium/builders/ci/chromeos-kevin-rel/16980

Original change's description:
> media/gpu/v4l2: add rudimentary V4L2Queue::SetFormat() method
> 
> Having information about the format currently set on a queue is
> valuable, e.g. to validate queued buffers. Rewrite the output queue
> format setting method of V4L2SliceVideoDecoder into an equivalent method
> of V4L2Queue, and use it from there.
> 
> Bug: 1003223
> Test: video_decode_accelerator_tests passing on Kevin.
> 
> Change-Id: Iaaf56809a46a0c193bf890c73b4bcfac4988374f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1839319
> Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
> Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
> Auto-Submit: Alexandre Courbot <acourbot@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#703198}

TBR=akahuang@chromium.org,hiroh@chromium.org,acourbot@chromium.org

Change-Id: I57a064a5b334aa2eba7175ae958dddc188c2120f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1003223
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1844007Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703210}