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This reverts commit 535e31ec.

Reason for revert: Broke code coverage builds: crbug.com/891320

Bug: 891320

Original change's description:
> viz: HitTest debug logging.
>
> Ctrl+Shift+H to trigger. Requires --enable-viz-hit-test-debug flag and logging level of 1 on hit_test_debug_key_event_observer.
>
> Adds observer to render_widget_host_impl to act on OnInputEventAck.
>
> Example: https://pastebin.com/pcxrZv6A
>
> R=​riajiang@chromium.org
>
> Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
> Change-Id: I1c9a0867debe5b4aa670a51f85fe24909073374c
> Reviewed-on: https://chromium-review.googlesource.com/1226099
> Commit-Queue: Alexander Shah <zandershah@google.com>
> Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
> Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
> Reviewed-by: Ria Jiang <riajiang@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#595563}

TBR=sadrul@chromium.org,nzolghadr@chromium.org,riajiang@chromium.org,zandershah@google.com

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

Change-Id: I51780234c0ee6ed9e4cdae71ef839cc5b4f633f7
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Reviewed-on: https://chromium-review.googlesource.com/c/1262926
Commit-Queue: Max Moroz <mmoroz@chromium.org>
Reviewed-by: Max Moroz <mmoroz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596925}