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Fix mouse-pointer-preventdefault for Firefox/Safari

Safari and Firefox fire pointerevents & compatible mouse
events in a different order than Chrome. The order matches the
PointerEvents specification for all browsers. Modify the test to
reflect this difference in the browser implementation.

Bug: 1085549, 1085647
Change-Id: I43ed0bbbabb0abbcbd93fbab7e5d8ee98a902611
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2359588Reviewed-by: Mustaq Ahmed <mustaq@chromium.org>
Commit-Queue: Liviu Tinta <liviutinta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801077}