Remove special wheel handling path from ScrollableArea

Source/core/frame/RootFrameViewport.h

Index: Source/core/frame/RootFrameViewport.h
diff --git a/Source/core/frame/RootFrameViewport.h b/Source/core/frame/RootFrameViewport.h
index 2e2c9c864f74c9d55a97894b15c3c29e1bf7e9f6..20b7ce02a7681a927aa1d5b950213d0397ee9dd0 100644
--- a/Source/core/frame/RootFrameViewport.h
+++ b/Source/core/frame/RootFrameViewport.h
@@ -68,10 +68,6 @@ public:
     void serviceScrollAnimations(double) override;
     void updateCompositorScrollAnimations() override;
     ScrollBehavior scrollBehaviorStyle() const override;
-    // TODO(bokan): This method should be removed. It should be replaced by
-    // making EventHandler::handleWheelEvent unpack the WheelEvent and make a
-    // call to this class' scroll method.
-    ScrollResult handleWheel(const PlatformWheelEvent&) override;
 
 private:
     RootFrameViewport(ScrollableArea& visualViewport, ScrollableArea& layoutViewport, bool invertScrollOrder);