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This reverts commit 9bbdf45e.

Reason for revert: The patch verified that the reporting is accurate, no
crashes were introduced from the added CHECKs. And we have enough data
to check the UKM logs.

Original change's description:
> cc: Disable checker-imaging for decode=async tag.
> 
> Temporarily disabling checkering of decode=async tag images to debug
> entries in ukm logs for checkerboarded images in the control group for
> checkerimaging finch study.
> 
> R=​vmpstr@chromium.org
> 
> Bug: 833666
> Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
> Change-Id: Ib9a79262599efa17fd18e9cb71d7518492e9a7ee
> Reviewed-on: https://chromium-review.googlesource.com/1014644
> Reviewed-by: vmpstr <vmpstr@chromium.org>
> Commit-Queue: Khushal <khushalsagar@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#551513}

TBR=vmpstr@chromium.org,khushalsagar@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 833666
Change-Id: I3425d7a7b4cc6d57ec26fee7ddee8827e97992dd
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Reviewed-on: https://chromium-review.googlesource.com/1029090Reviewed-by: Khushal <khushalsagar@chromium.org>
Commit-Queue: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553837}