Tentatively re-enable SitePerProcessHitTestBrowserTest.ScrollEventToOOPIF.

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: 833380
Change-Id: I62db026d3163e018594018800498fed3381d76bf
Reviewed-on: https://chromium-review.googlesource.com/1203873
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Commit-Queue: James MacLean <wjmaclean@chromium.org>
Cr-Commit-Position: refs/heads/master@{#588519}
1 file changed