Revert 140571

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

 /*
  * Copyright (C) 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 141 matching lines @@
     if (scrollPosition().y() < minimumScrollPosition().y())
         stretch.setHeight(scrollPosition().y() - minimumScrollPosition().y());
     else if (scrollPosition().y() > maximumScrollPosition().y())
         stretch.setHeight(scrollPosition().y() - maximumScrollPosition().y());
 
     if (scrollPosition().x() < minimumScrollPosition().x())
         stretch.setWidth(scrollPosition().x() - minimumScrollPosition().x());
     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;
 }
 
 bool ScrollingTreeScrollingNodeMac::pinnedInDirection(const FloatSize& delta)
 {
     FloatSize limitDelta;
 
     if (fabsf(delta.height()) >= fabsf(delta.width())) {
         if (delta.height() < 0) {
             // We are trying to scroll up.  Make sure we are not pinned to the top
@@ skipping 64 matching lines @@
         m_scrollElasticityController.snapRubberBandTimerFired();
     }));
     CFRunLoopAddTimer(CFRunLoopGetCurrent(), m_snapRubberbandTimer.get(), kCFRunLoopDefaultMode);
 }
 
 void ScrollingTreeScrollingNodeMac::stopSnapRubberbandTimer()
 {
     if (!m_snapRubberbandTimer)
         return;
 
-    scrollingTree()->setMainFrameIsRubberBanding(false);
-
     CFRunLoopTimerInvalidate(m_snapRubberbandTimer.get());
     m_snapRubberbandTimer = nullptr;
 }
 
 IntPoint ScrollingTreeScrollingNodeMac::scrollPosition() const
 {
     if (shouldUpdateScrollLayerPositionOnMainThread())
         return m_probableMainThreadScrollPosition;
 
     CGPoint scrollLayerPosition = m_scrollLayer.get().position;
@@ skipping 139 matching lines @@
 }
 
 void logWheelEventHandlerCountChanged(unsigned count)
 {
     WTFLogAlways("SCROLLING: Wheel event handler count changed. Time: %f Count: %u\n", WTF::monotonicallyIncreasingTime(), count);
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(THREADED_SCROLLING)