Remove ScrollableArea::notifyScrollPositionChanged and cleanup scroll animators.

Source/core/page/Page.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All Rights Reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 299 matching lines @@
 
     if (scale != viewport.scale()) {
         viewport.setScale(scale);
 
         chromeClient().pageScaleFactorChanged();
 
         deprecatedLocalMainFrame()->loader().saveScrollState();
     }
 
     if (view && view->scrollPosition() != origin)
-        view->notifyScrollPositionChanged(origin);
+        view->setScrollPosition(origin, ProgrammaticScroll);
 }
 
 float Page::pageScaleFactor() const
 {
     return frameHost().pinchViewport().scale();
 }
 
 void Page::setDeviceScaleFactor(float scaleFactor)
 {
     if (m_deviceScaleFactor == scaleFactor)
@@ skipping 263 matching lines @@
 {
 }
 
 Page::PageClients::~PageClients()
 {
 }
 
 template class CORE_TEMPLATE_EXPORT WillBeHeapSupplement<Page>;
 
 } // namespace blink