Oilpan: move editing objects to the heap.

Source/core/editing/VisiblePosition.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Portions Copyright (c) 2011 Motorola Mobility, 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 772 matching lines @@
     if (visiblePosition.isNull())
         return false;
 
     if (!visiblePosition.deepEquivalent().containerNode()->isDescendantOf(node))
         return false;
 
     VisiblePosition next = visiblePosition.next();
     return next.isNull() || !next.deepEquivalent().deprecatedNode()->isDescendantOf(node);
 }
 
+void VisiblePosition::trace(Visitor* visitor)
+{
+    visitor->trace(m_deepPosition);
+}
+
 }  // namespace WebCore
 
 #ifndef NDEBUG
 
 void showTree(const WebCore::VisiblePosition* vpos)
 {
     if (vpos)
         vpos->showTreeForThis();
 }
 
 void showTree(const WebCore::VisiblePosition& vpos)
 {
     vpos.showTreeForThis();
 }
 
 #endif