Selectively disable rubber banding on mac.

Source/web/WebPagePopupImpl.cpp

 /*
  * 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 352 matching lines @@
     if (m_closing || !m_page || !m_page->mainFrame() || !m_page->mainFrame()->view())
         return false;
     LocalFrame& frame = *m_page->mainFrame();
     return frame.eventHandler().handleGestureEvent(PlatformGestureEventBuilder(frame.view(), event));
 }
 
 bool WebPagePopupImpl::handleInputEvent(const WebInputEvent& event)
 {
     if (m_closing)
         return false;
-    return PageWidgetDelegate::handleInputEvent(m_page.get(), *this, event);
+    return PageWidgetDelegate::handleInputEvent(m_page.get(), *this, event, true, true);
 }
 
 bool WebPagePopupImpl::handleKeyEvent(const PlatformKeyboardEvent& event)
 {
     if (m_closing || !m_page->mainFrame() || !m_page->mainFrame()->view())
         return false;
     return m_page->mainFrame()->eventHandler().keyEvent(event);
 }
 
 void WebPagePopupImpl::setFocus(bool enable)
@@ skipping 42 matching lines @@
     // A WebPagePopupImpl instance usually has two references.
     //  - One owned by the instance itself. It represents the visible widget.
     //  - One owned by a WebViewImpl. It's released when the WebViewImpl ask the
     //    WebPagePopupImpl to close.
     // We need them because the closing operation is asynchronous and the widget
     // can be closed while the WebViewImpl is unaware of it.
     return adoptRef(new WebPagePopupImpl(client)).leakRef();
 }
 
 } // namespace blink