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Cleanup double StopMonitor and unnecessary condition, leftover from mouse listener removal in https://crrev.com/2577573002.

Bug: 828864
Change-Id: Ia19c5bf4f81897f49b1c0eaf0f6d85a9cfff4984
Reviewed-on: https://chromium-review.googlesource.com/1007194Reviewed-by: Max Morin <maxmorin@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Marina Ciocea <marinaciocea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550032}