Oilpan: Move the EventListener hierarchy to Oilpan's heap

Source/core/dom/ProcessingInstruction.cpp

 /*
  * Copyright (C) 2000 Peter Kelly (pmk@post.com)
  * Copyright (C) 2006, 2008, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 48 matching lines @@
 {
 #if !ENABLE(OILPAN)
     if (m_sheet)
         clearSheet();
 
     // FIXME: ProcessingInstruction should not be in document here.
     // However, if we add ASSERT(!inDocument()), fast/xsl/xslt-entity.xml
     // crashes. We need to investigate ProcessingInstruction lifetime.
     if (inDocument() && m_isCSS)
         document().styleEngine().removeStyleSheetCandidateNode(this);
+    clearEventListenerForXSLT();
 #endif
-    clearEventListenerForXSLT();
 }
 
 EventListener* ProcessingInstruction::eventListenerForXSLT()
 {
     if (!m_listenerForXSLT)
         return 0;
 
     return m_listenerForXSLT->toEventListener();
 }
 
@@ skipping 221 matching lines @@
 {
     ASSERT(m_sheet);
     if (m_sheet->isLoading())
         document().styleEngine().removePendingSheet(this);
     m_sheet.release()->clearOwnerNode();
 }
 
 DEFINE_TRACE(ProcessingInstruction)
 {
     visitor->trace(m_sheet);
+    visitor->trace(m_listenerForXSLT);
     CharacterData::trace(visitor);
 }
 
 } // namespace