Revert changes to RenderLayer::scrollByRecursively() that were added for gesture-scrolling
https://bugs.webkit.org/show_bug.cgi?id=111007

Reviewed by Simon Fraser.

Due to http://trac.webkit.org/changeset/144519 landing, the changes made to RenderLayer in
http://trac.webkit.org/changeset/142057,
http://trac.webkit.org/changeset/140177, and
http://trac.webkit.org/changeset/142195
are no longer necessary (as RenderLayer::scrollByRecursively() is not used for
gesture-scrolling) and should be reverted.

No change in behavior, so no new tests needed.

* rendering/RenderLayer.cpp:
(WebCore::RenderLayer::scrollByRecursively):
* rendering/RenderLayer.h:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@144709 268f45cc-cd09-0410-ab3c-d52691b4dbfc