Remove ScrollableArea::GetFrameViewBase and move ScheduleAnimation into subclasses.

third_party/WebKit/Source/platform/scroll/ScrollableArea.h

 /*
  * Copyright (C) 2008, 2011 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 243 matching lines @@
   virtual bool ScrollAnimatorEnabled() const { return false; }
 
   // NOTE: Only called from Internals for testing.
   void UpdateScrollOffsetFromInternals(const IntSize&);
 
   IntSize ClampScrollOffset(const IntSize&) const;
   ScrollOffset ClampScrollOffset(const ScrollOffset&) const;
 
   // Let subclasses provide a way of asking for and servicing scroll
   // animations.
-  virtual bool ScheduleAnimation();
+  virtual bool ScheduleAnimation() { return false; }
   virtual void ServiceScrollAnimations(double monotonic_time);
   virtual void UpdateCompositorScrollAnimations();
   virtual void RegisterForAnimation() {}
   virtual void DeregisterForAnimation() {}
 
   virtual bool UsesCompositedScrolling() const { return false; }
   virtual bool ShouldScrollOnMainThread() const;
 
   // Overlay scrollbars can "fade-out" when inactive.
   virtual bool ScrollbarsHidden() const;
@@ skipping 59 matching lines @@
 
   // Subtracts space occupied by this ScrollableArea's scrollbars.
   // Does nothing if overlay scrollbars are enabled.
   IntSize ExcludeScrollbars(const IntSize&) const;
 
   virtual int VerticalScrollbarWidth(
       OverlayScrollbarClipBehavior = kIgnorePlatformOverlayScrollbarSize) const;
   virtual int HorizontalScrollbarHeight(
       OverlayScrollbarClipBehavior = kIgnorePlatformOverlayScrollbarSize) const;
 
-  // Returns the widget associated with this ScrollableArea.
-  virtual FrameViewBase* GetFrameViewBase() { return nullptr; }
-
   virtual LayoutBox* GetLayoutBox() const { return nullptr; }
 
   // Maps a quad from the coordinate system of a LayoutObject contained by the
   // ScrollableArea to the coordinate system of the ScrollableArea's visible
   // content rect.  If the LayoutObject* argument is null, the argument quad is
   // considered to be in the coordinate space of the overflow rect.
   virtual FloatQuad LocalToVisibleContentQuad(const FloatQuad&,
                                               const LayoutObject*,
                                               unsigned = 0) const;
 
@@ skipping 105 matching lines @@
   // vertical-lr / ltr            NO                      NO
   // vertical-lr / rtl            NO                      YES
   // vertical-rl / ltr            YES                     NO
   // vertical-rl / rtl            YES                     YES
   IntPoint scroll_origin_;
 };
 
 }  // namespace blink
 
 #endif  // ScrollableArea_h