Revert of Early terminate flings when scrolling impossible

Revert of Early terminate flings when scrolling impossible (https://codereview.chromium.org/136173004/)

Reason for revert:
Broke a layout test, fast/events/touch/gesture/pad-gesture-fling.html

http://test-results.appspot.com/dashboards/flakiness_dashboard.html#group=%40ToT%20Blink&tests=fast%2Fevents%2Ftouch%2Fgesture%2Fpad-gesture-fling.html


Original issue's description:
> Early terminate flings when scrolling impossible
> 
> Previously, flings were terminated early only if the root layer overscrolled.
> Now, flings will terminate if the fling target's |scrollBy()| method returns
> false, providing consistency between layer types and saving battery on
> sites with scrolling sublayers.
> 
> Also move |DidOverscrollParams| into content/ in anticipation of using it
> directly in the overscroll IPC message.
> 
> Corresponding Blink patch:
> https://codereview.chromium.org/139493003/
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=260631

TBR=aelias@chromium.org,jochen@chromium.org,jdduke@chromium.org
NOTREECHECKS=true
NOTRY=true

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=260773

[tkent, 2014-04-01 04:16:33]

Created Revert of Early terminate flings when scrolling impossible

[commit-bot: I haz the power, 2014-04-01 04:16:36]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/tkent@chromium.org/213743004/1

[commit-bot: I haz the power, 2014-04-01 04:17:42]

Change committed as 260773

[jdduke (slow), 2014-04-02 15:37:25]

A revert of this CL has been created in
https://codereview.chromium.org/222353002/ by jdduke@chromium.org.

The reason for reverting is: The broken fling layout test has been fixed in:
https://codereview.chromium.org/219243010/.