Revert of Expose scroll customization for touch to JS (behind REF).

Revert of Expose scroll customization for touch to JS (behind REF). (patchset #9 id:200001 of https://codereview.chromium.org/1209183004/)

Reason for revert:
The change introduced some leaks on our bots for:
virtual/scroll_customization/fast/scroll-behavior/scroll-customization/scrollstate-distribute-to-scroll-chain-descendant.html
virtual/scroll_customization/fast/scroll-behavior/scroll-customization/touch-scroll-customization.html

Output is:
({"numberOfLiveActiveDOMObjects":[2,4],"numberOfLiveDocuments":[1,2],"numberOfLiveNodes":[4,36],"numberOfLiveResources":[0,2]})

Full output:
https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux%20Leak/builds/12632/steps/webkit_tests/logs/stdio

Original issue's description:
> Expose scroll customization for touch to JS (behind REF).
> 
> This enables scroll customization of touch scrolls for JS.  See
> http://goo.gl/xCBm7L for details. This is a followup to
> https://codereview.chromium.org/988823003, and completes landing
> https://codereview.chromium.org/850443002/.
> 
> This approach replaces the previous approach, from
> https://codereview.chromium.org/1057603002.
> 
> BUG=410974
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=199049

TBR=haraken@chromium.org,skobes@chromium.org,tdresser@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=410974
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=199065

[Julien - ping for review, 2015-07-17 00:19:55]

Created Revert of Expose scroll customization for touch to JS (behind REF).

[commit-bot: I haz the power, 2015-07-17 00:20:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1239993005/1

[haraken, 2015-07-17 00:20:46]

LGTM

[commit-bot: I haz the power, 2015-07-17 00:21:25]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=199065