Clean up wheel scroll latching and async wheel events flags.

This cl removes the wheel scroll latching and async wheel event flags
which have been enabled by default since M65.

Bug: 859171
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_layout_tests_layout_ng;luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I9597a055774fe3d38f15444e41c0236ed564a3a9
Reviewed-on: https://chromium-review.googlesource.com/1121057
Commit-Queue: Sahel Sharify <sahel@chromium.org>
Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: Kevin McNee <mcnee@chromium.org>
Reviewed-by: Timothy Dresser <tdresser@chromium.org>
Reviewed-by: David Bokan <bokan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#574316}
67 files changed