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- Add final strings for mouse and touchpad acceleration

BUG=chromium:589190
TEST=visual confirmation

Change-Id: I009ad45a802e3717a0cf4c6ddc151b4191732f85
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1831452Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701667}