Remove special wheel handling path from ScrollableArea

Source/platform/scroll/ScrollableArea.h

 /*
  * Copyright (C) 2008, 2011 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 84 matching lines @@
     // since scrolling it can't change the location of content relative to the document, unlike an overflowing
     // element.
     virtual LayoutRect scrollIntoView(const LayoutRect& rectInContent, const ScrollAlignment& alignX, const ScrollAlignment& alignY);
 
     // Scrolls the area so that the given rect, given in the area's content coordinates, such that it's
     // cenetered in the second rect, which is given relative to the area's origin.
     void scrollIntoRect(const LayoutRect& rectInContent, const FloatRect& targetRectInFrame);
 
     static bool scrollBehaviorFromString(const String&, ScrollBehavior&);
 
-    virtual ScrollResult handleWheel(const PlatformWheelEvent&);
-
     bool inLiveResize() const { return m_inLiveResize; }
     void willStartLiveResize();
     void willEndLiveResize();
 
     void contentAreaWillPaint() const;
     void mouseEnteredContentArea() const;
     void mouseExitedContentArea() const;
     void mouseMovedInContentArea() const;
     void mouseEnteredScrollbar(Scrollbar*) const;
     void mouseExitedScrollbar(Scrollbar*) const;
@@ skipping 250 matching lines @@
     // vertical-lr / ltr            NO                      NO
     // vertical-lr / rtl            NO                      YES
     // vertical-rl / ltr            YES                     NO
     // vertical-rl / rtl            YES                     YES
     IntPoint m_scrollOrigin;
 };
 
 } // namespace blink
 
 #endif // ScrollableArea_h