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The logic to check if we should handle certain scrolls was moved to
shelf_layout_manager.cc in [1]. The logic remaining in
home_laucher_gesture_handler.cc is no longer needed.

[1] https://chromium-review.googlesource.com/c/1307233

Test: manual
Bug: 896790
Change-Id: Ic4b8a65ff8b4f6f3b5ed39147c09a68506bb1181
Reviewed-on: https://chromium-review.googlesource.com/c/1334648
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608205}