Revert "Floating Keyboard stops propagation of drag handle events"

This reverts commit 6b3d6841cf0897f2824c799098d6c24eaa0ac679.

Reason for revert: Please refer to crbug.com/831521 . We need to pass tap events in the drag handle.

Original change's description:
> Floating Keyboard stops propagation of drag handle events
> 
> If a touch/mouse event occurs and it is interpreted as a floating
> keyboard drag event, do not propagate the event to the javascript
> keyboard extension as there is no reason to.
> 
> This was causing the drag event to cause the gesture swiping to be
> active while dragging the keyboard around, particularly if the keyboard
> was bounded to the bottom of the screen and the user's finger is able
> to move around on the keys while still moving the keyboard (see
> attached bug for repro/video).
> 
> Bug: 826078
> Change-Id: I40c859f979d41a5d61e88ff0bd41808dcf3940c2
> Reviewed-on: https://chromium-review.googlesource.com/997195
> Reviewed-by: Yuichiro Hanada <yhanada@chromium.org>
> Commit-Queue: Blake O'Hare <blakeo@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#548374}

TBR=yhanada@chromium.org,blakeo@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 826078
Bug: 831521
Change-Id: I9dded92a6e7b2ec1f97ebd169c463686c23d5d7c
Reviewed-on: https://chromium-review.googlesource.com/1006715
Commit-Queue: Yuichiro Hanada <yhanada@chromium.org>
Reviewed-by: Yuichiro Hanada <yhanada@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549862}
9 files changed