Remove dead code processing wheel gesture phase.

third_party/WebKit/Source/platform/mac/ScrollAnimatorMac.h

Index: third_party/WebKit/Source/platform/mac/ScrollAnimatorMac.h
diff --git a/third_party/WebKit/Source/platform/mac/ScrollAnimatorMac.h b/third_party/WebKit/Source/platform/mac/ScrollAnimatorMac.h
index 800a12218066620fc43c3699b5523dcb3fdb8c2e..05e5c9a36233cf60904bd68ca09579ca3ff148d3 100644
--- a/third_party/WebKit/Source/platform/mac/ScrollAnimatorMac.h
+++ b/third_party/WebKit/Source/platform/mac/ScrollAnimatorMac.h
@@ -92,8 +92,6 @@ class PLATFORM_EXPORT ScrollAnimatorMac : public ScrollAnimatorBase {
                           const ScrollOffset& delta) override;
   void scrollToOffsetWithoutAnimation(const ScrollOffset&) override;
 
-  void handleWheelEventPhase(PlatformWheelEventPhase) override;
-
   void cancelAnimation() override;
 
   void contentAreaWillPaint() const override;
@@ -105,9 +103,6 @@ class PLATFORM_EXPORT ScrollAnimatorMac : public ScrollAnimatorBase {
   void contentsResized() const override;
   void contentAreaDidShow() const override;
   void contentAreaDidHide() const override;
-  void didBeginScrollGesture() const;
-  void didEndScrollGesture() const;
-  void mayBeginScrollGesture() const;
 
   void finishCurrentScrollAnimations() override;