Revert of Remove Overlay Scrollbar if not scrollable along the axis (patchset #9 id:1140001 of https://codereview.chromium.org/588013002/)

Reason for revert:
This has resulted in multiple webkit_unit_tests crashes on android_dbg_tests_recipe, blocking a Blink roll.

Original issue's description:
> Remove Overlay Scrollbar if not scrollable along the axis
>
> Remove Overlay Scrollbar if not scrollable along that axis. If the
> scrollSize along that axis is zero then set scrollbar along that
> axis to false. This is applicable to Solid-Color scrollbars in Android
> & Overlay scrollbars in the Aura.
>
> BUG=415031
>
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=183445

TBR=enne@chromium.org,vollick@chromium.org,sataya.m@samsung.com
NOTREECHECKS=true
NOTRY=true
BUG=415031

Review URL: https://codereview.chromium.org/644983002

git-svn-id: svn://svn.chromium.org/blink/trunk@183520 bbb929c8-8fbe-4397-9dbb-9b2b20218538