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This CL changes RewriteTouchEvent and RewriteScrollEvent to use the new
API. These two methods seems to be the easiest to rewrite.

Bug: 1049489
Test: unit_tests
Change-Id: Ic133c9c829883728b4a65d04e0470c36f891c203
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2041131
Commit-Queue: Yuichiro Hanada <yhanada@chromium.org>
Reviewed-by: Kevin Schoedel <kpschoedel@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739229}