Selectively disable rubber banding on mac.

Source/web/PageWidgetDelegate.h

 /*
  * Copyright (C) 2012 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 39 matching lines @@
 class WebMouseEvent;
 class WebMouseWheelEvent;
 class WebTouchEvent;
 
 class PageWidgetEventHandler {
 public:
     virtual void handleMouseMove(WebCore::LocalFrame& mainFrame, const WebMouseEvent&);
     virtual void handleMouseLeave(WebCore::LocalFrame& mainFrame, const WebMouseEvent&);
     virtual void handleMouseDown(WebCore::LocalFrame& mainFrame, const WebMouseEvent&);
     virtual void handleMouseUp(WebCore::LocalFrame& mainFrame, const WebMouseEvent&);
-    virtual bool handleMouseWheel(WebCore::LocalFrame& mainFrame, const WebMouseWheelEvent&);
+    virtual bool handleMouseWheel(WebCore::LocalFrame& mainFrame, const WebMouseWheelEvent&, bool canRubberbandLeft, bool canRubberbandRight);
     virtual bool handleKeyEvent(const WebKeyboardEvent&) = 0;
     virtual bool handleCharEvent(const WebKeyboardEvent&) = 0;
     virtual bool handleGestureEvent(const WebGestureEvent&) = 0;
     virtual bool handleTouchEvent(WebCore::LocalFrame& mainFrame, const WebTouchEvent&);
     virtual ~PageWidgetEventHandler() { }
 };
 
 
 // Common implementation of WebViewImpl and WebPagePopupImpl.
 class PageWidgetDelegate {
 public:
     enum CanvasBackground {
         Opaque,
         Translucent,
     };
     static void animate(WebCore::Page*, double monotonicFrameBeginTime);
     static void layout(WebCore::Page*);
     static void paint(WebCore::Page*, PageOverlayList*, WebCanvas*, const WebRect&, CanvasBackground);
-    static bool handleInputEvent(WebCore::Page*, PageWidgetEventHandler&, const WebInputEvent&);
+    static bool handleInputEvent(WebCore::Page*, PageWidgetEventHandler&, const WebInputEvent&, bool canRubberbandLeft, bool canRubberbandRight);
 
 private:
     PageWidgetDelegate() { }
 };
 
 }
 #endif