Remove dead code processing wheel gesture phase.

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

Index: third_party/WebKit/Source/platform/scroll/ScrollAnimatorBase.h
diff --git a/third_party/WebKit/Source/platform/scroll/ScrollAnimatorBase.h b/third_party/WebKit/Source/platform/scroll/ScrollAnimatorBase.h
index 42d431d2e8e326c917dc62ae352a516c45294128..6a81c42be107b6ca140a48fce0db3d9394efae62 100644
--- a/third_party/WebKit/Source/platform/scroll/ScrollAnimatorBase.h
+++ b/third_party/WebKit/Source/platform/scroll/ScrollAnimatorBase.h
@@ -63,10 +63,6 @@ class PLATFORM_EXPORT ScrollAnimatorBase
 
   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(); }