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This CL simplifies the toast string for reverse scrolling gestures.

Bug: 1107183
Change-Id: I99dca9a8d787d39025c67b1fb8d5e319d1807659
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533873
Commit-Queue: Xiaodan Zhu <zxdan@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826628}