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These tests rely on assumptions on Chrome's old user gesture model.
This CL fixes the assumptions for the new model (UAv2).

Bug: 908531
Change-Id: I3d290489075f81f5c8fd414c050d1beabab48488
Reviewed-on: https://chromium-review.googlesource.com/c/1351570Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Peter Conn <peconn@chromium.org>
Commit-Queue: Mustaq Ahmed <mustaq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611100}