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In https://crrev.com/0bb413bf71 WillHandleGestureEvent was no longer
needed on the public API.
In https://crrev.com//23748d4a10c7a DidHandleGestureScrollEvent was
no longer needed on the public API.

BUG=1097816

Change-Id: I5981bb76f875bde137aa50c88cb5516d12b7ea02
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2424503
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809988}