Oilpan: Ensure that classes with virtual trace methods always have vtables for their left-most base…

Source/core/xml/parser/XMLDocumentParser.cpp

 /*
  * Copyright (C) 2000 Peter Kelly (pmk@post.com)
  * Copyright (C) 2005, 2006, 2008, 2014 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008 Holger Hans Peter Freyther
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 839 matching lines @@
 void XMLDocumentParser::trace(Visitor* visitor)
 {
     visitor->trace(m_currentNode);
 #if ENABLE(OILPAN)
     visitor->trace(m_currentNodeStack);
 #endif
     visitor->trace(m_leafTextNode);
     visitor->trace(m_xmlErrors);
     visitor->trace(m_scriptElement);
     ScriptableDocumentParser::trace(visitor);
+    ResourceClient::trace(visitor);
 }
 
 void XMLDocumentParser::doWrite(const String& parseString)
 {
     TRACE_EVENT0("blink", "XMLDocumentParser::doWrite");
     ASSERT(!isDetached());
     if (!m_context)
         initializeParserContext();
 
     // Protect the libxml context from deletion during a callback
@@ skipping 759 matching lines @@
     sax.initialized = XML_SAX2_MAGIC;
     RefPtr<XMLParserContext> parser = XMLParserContext::createStringParser(&sax, &state);
     String parseString = "<?xml version=\"1.0\"?><attrs " + string + " />";
     parseChunk(parser->context(), parseString);
     finishParsing(parser->context());
     attrsOK = state.gotAttributes;
     return state.attributes;
 }
 
 } // namespace blink