Remove ScrollableArea::notifyScrollPositionChanged and cleanup scroll animators.

Source/web/WebLocalFrameImpl.cpp

 /*
  * Copyright (C) 2009 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 677 matching lines @@
 {
     FrameView* view = frameView();
     if (!view)
         return WebSize();
     return toIntSize(view->maximumScrollPosition());
 }
 
 void WebLocalFrameImpl::setScrollOffset(const WebSize& offset)
 {
     if (FrameView* view = frameView())
-        view->notifyScrollPositionChanged(IntPoint(offset.width, offset.height));
+        view->setScrollPosition(IntPoint(offset.width, offset.height), ProgrammaticScroll);
 }
 
 WebSize WebLocalFrameImpl::contentsSize() const
 {
     if (FrameView* view = frameView())
         return view->contentsSize();
     return WebSize();
 }
 
 bool WebLocalFrameImpl::hasVisibleContent() const
@@ skipping 1455 matching lines @@
 {
     m_frameWidget = frameWidget;
 }
 
 WebFrameWidgetImpl* WebLocalFrameImpl::frameWidget() const
 {
     return m_frameWidget;
 }
 
 } // namespace blink