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This CL migrates some UserActivation related web_tests (layouttests)
to use testdriver (or gpubenchmarking), instead of EventSender.

This CL also fixes these test with BrowserVerifiedUserActivationTypeMouse
enabled. Because EventSender generated events are not from browser side,
so the browser side verification will failed. This CL update the failing
mouse type tests to use either testdriver or gpubenchmarking, so that
events are correctly dispatch from browser side.

Bug: 848778
Change-Id: I23380932d083aef18cf1f54d82621e5e96c52ad5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872928
Commit-Queue: Ella Ge <eirage@chromium.org>
Reviewed-by: Mustaq Ahmed <mustaq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720011}