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This reverts commit 90e9d5ae.

Reason for revert: The test is still flaky.

Original change's description:
> Tentatively re-enable SitePerProcessHitTestBrowserTest.TouchActionAckTimeout
> 
> A number of changes have landed recently that may eliminate the
> flakieness seen in this test. This CL re-enables the test, but feel
> free to revert this if the flakes continue.
> 
> Bug: 871062
> Change-Id: Iad353f9aecbf2eb59c4831ef70658f08c13a47a9
> Reviewed-on: https://chromium-review.googlesource.com/1217087
> Reviewed-by: Ken Buchanan <kenrb@chromium.org>
> Commit-Queue: James MacLean <wjmaclean@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#590047}

TBR=kenrb@chromium.org,wjmaclean@chromium.org

Change-Id: I7467a05dc55da2a98e0e5476bb4088e64ffb7d01
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 871062
Reviewed-on: https://chromium-review.googlesource.com/1218306Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590226}