Selectively disable rubber banding on mac.

Source/web/WebViewImpl.h

Index: Source/web/WebViewImpl.h
diff --git a/Source/web/WebViewImpl.h b/Source/web/WebViewImpl.h
index fdc747f92bab686ad821eff6dfd23388f24b27c1..77c35a90b0da9bb0abeee8570fcd53cb703ccd1c 100644
--- a/Source/web/WebViewImpl.h
+++ b/Source/web/WebViewImpl.h
@@ -135,6 +135,7 @@ public:
     virtual bool isTrackingRepaints() const OVERRIDE;
     virtual void themeChanged() OVERRIDE;
     virtual bool handleInputEvent(const WebInputEvent&) OVERRIDE;
+    virtual bool handleInputEvent(const WebInputEvent&, bool canRubberbandLeft, bool canRubberbandRight) OVERRIDE;
     virtual void setCursorVisibilityState(bool isVisible) OVERRIDE;
     virtual bool hasTouchEventHandlersAt(const WebPoint&) OVERRIDE;
     virtual void applyScrollAndScale(const WebSize&, float) OVERRIDE;
@@ -595,7 +596,7 @@ private:
     virtual void handleMouseLeave(WebCore::LocalFrame&, const WebMouseEvent&) OVERRIDE;
     virtual void handleMouseDown(WebCore::LocalFrame&, const WebMouseEvent&) OVERRIDE;
     virtual void handleMouseUp(WebCore::LocalFrame&, const WebMouseEvent&) OVERRIDE;
-    virtual bool handleMouseWheel(WebCore::LocalFrame&, const WebMouseWheelEvent&) OVERRIDE;
+    virtual bool handleMouseWheel(WebCore::LocalFrame& mainFrame, const WebMouseWheelEvent&, bool canRubberbandLeft, bool canRubberbandRight) OVERRIDE;
     virtual bool handleGestureEvent(const WebGestureEvent&) OVERRIDE;
     virtual bool handleKeyEvent(const WebKeyboardEvent&) OVERRIDE;
     virtual bool handleCharEvent(const WebKeyboardEvent&) OVERRIDE;