Disable flaky CursorUpdateReceivedFromCrossSiteIframe tests

Both in SitePerProcessHitTestBrowserTest and in
SitePerProcessHighDPIHitTestBrowserTest.

TBR=mcnee@chromium.org

Bug: 833380
Change-Id: I5469e74827a6daaff72b6c85b2095866f91b601a
Reviewed-on: https://chromium-review.googlesource.com/1043869
Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556018}
1 file changed