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We currently leave the last touchscreen gesture target in
|touchscreen_gesture_target_| and only overwrite it upon the next
touchscreen gesture. This is a problem if the user switches from using a
touchscreen to another input device, since the scroll bubbling logic
will believe that there is an ongoing touchscreen gesture and drop any
attempts to bubble scroll to this target.

We now clear the target at the end of a touchscreen gesture (more
specifically, after dispatching a gesture event which indicates the lift
of the last finger).

Bug: 865151
Change-Id: I8fddc1ac9c36ebf9b84a59b1304784188c46f142
Reviewed-on: https://chromium-review.googlesource.com/c/1351744Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Commit-Queue: Kevin McNee <mcnee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613124}