Oilpan: move Touch related objects to the oilpan heap.

Source/core/events/TreeScopeEventContext.h

 /*
  * Copyright (C) 2014 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:
  * 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 54 matching lines @@
     TreeScopeEventContext(TreeScope&);
 
 #ifndef NDEBUG
     bool isUnreachableNode(EventTarget&);
 #endif
 
     TreeScope& m_treeScope;
     RefPtr<EventTarget> m_target;
     RefPtr<EventTarget> m_relatedTarget;
     RefPtr<NodeList> m_eventPath;
-    RefPtr<TouchEventContext> m_touchEventContext;
+    RefPtrWillBePersistent<TouchEventContext> m_touchEventContext;
 };
 
 #ifndef NDEBUG
 inline bool TreeScopeEventContext::isUnreachableNode(EventTarget& target)
 {
     // FIXME: Checks also for SVG elements.
     return target.toNode() && !target.toNode()->isSVGElement() && !target.toNode()->treeScope().isInclusiveOlderSiblingShadowRootOrAncestorTreeScopeOf(m_treeScope);
 }
 #endif
 
 inline void TreeScopeEventContext::setTarget(PassRefPtr<EventTarget> target)
 {
     ASSERT(target);
     ASSERT(!isUnreachableNode(*target));
     m_target = target;
 }
 
 inline void TreeScopeEventContext::setRelatedTarget(PassRefPtr<EventTarget> relatedTarget)
 {
     ASSERT(relatedTarget);
     ASSERT(!isUnreachableNode(*relatedTarget));
     m_relatedTarget = relatedTarget;
 }
 
 }
 
 #endif // TreeScopeEventContext_h