Remove log from mouse_event_manager.cc

The log is only for testing the flag that was just added for updating
hover, it is merged by mistake, now remove it.

TBR=bokan@chromium.org

Bug: 877132
Change-Id: I6a5ac31e7c7274dcd246f97d90487d8fbd945b45
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1719575
Reviewed-by: Lan Wei <lanwei@chromium.org>
Commit-Queue: Lan Wei <lanwei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681182}
1 file changed