Revert 140571

Source/WebCore/page/scrolling/mac/ScrollingTreeScrollingNodeMac.mm

Index: Source/WebCore/page/scrolling/mac/ScrollingTreeScrollingNodeMac.mm
===================================================================
--- Source/WebCore/page/scrolling/mac/ScrollingTreeScrollingNodeMac.mm	(revision 143052)
+++ Source/WebCore/page/scrolling/mac/ScrollingTreeScrollingNodeMac.mm	(working copy)
@@ -159,13 +159,6 @@
     else if (scrollPosition().x() > maximumScrollPosition().x())
         stretch.setWidth(scrollPosition().x() - maximumScrollPosition().x());
 
-    if (scrollingTree()->rootNode() == this) {
-        if (stretch.isZero())
-            scrollingTree()->setMainFrameIsRubberBanding(false);
-        else
-            scrollingTree()->setMainFrameIsRubberBanding(true);
-    }
-
     return stretch;
 }
 
@@ -250,8 +243,6 @@
     if (!m_snapRubberbandTimer)
         return;
 
-    scrollingTree()->setMainFrameIsRubberBanding(false);
-
     CFRunLoopTimerInvalidate(m_snapRubberbandTimer.get());
     m_snapRubberbandTimer = nullptr;
 }