Remove dead code processing wheel gesture phase.

third_party/WebKit/Source/platform/scroll/ScrollAnimatorBase.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 45 matching lines @@
   // A possibly animated scroll. The base class implementation always scrolls
   // immediately, never animates. If the scroll is animated and currently the
   // animator has an in-progress animation, the ScrollResult will always return
   // no unusedDelta and didScroll=true, i.e. fully consuming the scroll request.
   // This makes animations latch to a single scroller. Note, the semantics are
   // currently somewhat different on Mac - see ScrollAnimatorMac.mm.
   virtual ScrollResult userScroll(ScrollGranularity, const ScrollOffset& delta);
 
   virtual void scrollToOffsetWithoutAnimation(const ScrollOffset&);
 
-#if OS(MACOSX)
-  virtual void handleWheelEventPhase(PlatformWheelEventPhase) {}
-#endif
-
   void setCurrentOffset(const ScrollOffset&);
   ScrollOffset currentOffset() const;
   virtual ScrollOffset desiredTargetOffset() const { return currentOffset(); }
 
   // Returns how much of pixelDelta will be used by the underlying scrollable
   // area.
   virtual ScrollOffset computeDeltaToConsume(const ScrollOffset& delta) const;
 
   // ScrollAnimatorCompositorCoordinator implementation.
   ScrollableArea* getScrollableArea() const override {
@@ skipping 38 matching lines @@
   virtual void notifyOffsetChanged();
 
   Member<ScrollableArea> m_scrollableArea;
 
   ScrollOffset m_currentOffset;
 };
 
 }  // namespace blink
 
 #endif  // ScrollAnimatorBase_h