Remove dead code processing wheel gesture phase.

third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.h

Index: third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.h
diff --git a/third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.h b/third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.h
index 3b63359179e0a23052f9450d3169be8528d2658f..b5775ab80f437659a1792d800a4e512b198bac16 100644
--- a/third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.h
+++ b/third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.h
@@ -94,12 +94,6 @@ class CORE_EXPORT ScrollingCoordinator final
   // Should be called whenever the root layer for the given frame view changes.
   void frameViewRootLayerDidChange(FrameView*);
 
-#if OS(MACOSX)
-  // Dispatched by the scrolling tree during handleWheelEvent. This is required
-  // as long as scrollbars are painted on the main thread.
-  void handleWheelEventPhase(PlatformWheelEventPhase);
-#endif
-
   MainThreadScrollingReasons mainThreadScrollingReasons() const;
   bool shouldUpdateScrollLayerPositionOnMainThread() const {
     return mainThreadScrollingReasons() != 0;