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I previously made the DCHECK in WebGestureEvent::NeedsWheelEvent
more strict, but overlooked these callers. Here we update these
remaining callers so that they won't hit the DCHECK.

Bug: 787924, 802369
Change-Id: I65ae2dc873b25d0a3d770f2581a278b06ce7e7d8
Reviewed-on: https://chromium-review.googlesource.com/c/1286767Reviewed-by: James MacLean <wjmaclean@chromium.org>
Reviewed-by: Ben Wells <benwells@chromium.org>
Commit-Queue: Kevin McNee <mcnee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600782}