Enable DumpAccessibilityTree tests to use cross-process iframes.

third_party/WebKit/Source/modules/accessibility/AXScrollView.cpp

 /*
  * Copyright (C) 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
@@ skipping 231 matching lines @@
     if (!m_scrollView || !m_scrollView->isFrameView())
         return 0;
 
     HTMLFrameOwnerElement* owner = m_scrollView->frame().deprecatedLocalOwner();
     if (owner && owner->layoutObject())
         return axObjectCache().get(owner);
 
     return axObjectCache().get(m_scrollView->frame().pagePopupOwner());
 }
 
-ScrollableArea* AXScrollView::getScrollableAreaIfScrollable() const
-{
-    return m_scrollView;
-}
-
 DEFINE_TRACE(AXScrollView)
 {
     visitor->trace(m_scrollView);
     visitor->trace(m_horizontalScrollbar);
     visitor->trace(m_verticalScrollbar);
     AXObject::trace(visitor);
 }
 
 } // namespace blink