Remove ScrollableArea::notifyScrollPositionChanged and cleanup scroll animators.

Source/platform/scroll/ScrollAnimator.h

 /*
  * Copyright (c) 2010, 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 39 matching lines @@
 
     virtual ~ScrollAnimator();
 
     // Computes a scroll destination for the given parameters.  The returned
     // ScrollResultOneDimensional will have didScroll set to false if already at
     // the destination.  Otherwise, starts scrolling towards the destination and
     // didScroll is true.  Scrolling may be immediate or animated. The base
     // class implementation always scrolls immediately, never animates.
     virtual ScrollResultOneDimensional userScroll(ScrollbarOrientation, ScrollGranularity, float step, float delta);
 
-    virtual void scrollToOffsetWithoutAnimation(const FloatPoint&, ScrollType);
+    virtual void scrollToOffsetWithoutAnimation(const FloatPoint&);
 
     ScrollableArea* scrollableArea() const { return m_scrollableArea; }
 
     virtual void setIsActive() { }
 
     virtual ScrollResult handleWheelEvent(const PlatformWheelEvent&);
 
 #if OS(MACOSX)
     virtual void handleWheelEventPhase(PlatformWheelEventPhase) { }
 #endif
@@ skipping 25 matching lines @@
     virtual void didAddHorizontalScrollbar(Scrollbar*) { }
     virtual void willRemoveHorizontalScrollbar(Scrollbar*) { }
 
     virtual bool shouldScrollbarParticipateInHitTesting(Scrollbar*) { return true; }
 
     virtual void notifyContentAreaScrolled(const FloatSize&) { }
 
 protected:
     explicit ScrollAnimator(ScrollableArea*);
 
-    virtual void notifyPositionChanged(ScrollType);
+    virtual void notifyPositionChanged();
 
     ScrollableArea* m_scrollableArea;
     float m_currentPosX; // We avoid using a FloatPoint in order to reduce
     float m_currentPosY; // subclass code complexity.
 
 private:
     float clampScrollPosition(ScrollbarOrientation, float);
 };
 
 } // namespace blink
 
 #endif // ScrollAnimator_h