Oilpan: make DocumentFragment a heap allocated object.

Source/core/html/track/vtt/VTTParser.cpp

 /*
  * Copyright (C) 2011 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 303 matching lines @@
         return recoverCue(line);
     return BadCue;
 }
 
 // A helper class for the construction of a "cue fragment" from the cue text.
 class VTTTreeBuilder {
 public:
     VTTTreeBuilder(Document& document)
         : m_document(document) { }
 
-    PassRefPtr<DocumentFragment> buildFromString(const String& cueText);
+    PassRefPtrWillBeRawPtr<DocumentFragment> buildFromString(const String& cueText);
 
 private:
     void constructTreeFromToken(Document&);
 
     VTTToken m_token;
     RefPtr<ContainerNode> m_currentNode;
     Vector<AtomicString> m_languageStack;
     Document& m_document;
 };
 
-PassRefPtr<DocumentFragment> VTTTreeBuilder::buildFromString(const String& cueText)
+PassRefPtrWillBeRawPtr<DocumentFragment> VTTTreeBuilder::buildFromString(const String& cueText)
 {
     // Cue text processing based on
     // 5.4 WebVTT cue text parsing rules, and
     // 5.5 WebVTT cue text DOM construction rules
 
-    RefPtr<DocumentFragment> fragment = DocumentFragment::create(m_document);
+    RefPtrWillBeRawPtr<DocumentFragment> fragment = DocumentFragment::create(m_document);
 
     if (cueText.isEmpty()) {
         fragment->parserAppendChild(Text::create(m_document, ""));
         return fragment;
     }
 
     m_currentNode = fragment;
 
     VTTTokenizer tokenizer(cueText);
     m_languageStack.clear();
 
     while (tokenizer.nextToken(m_token))
         constructTreeFromToken(m_document);
 
     return fragment.release();
 }
 
-PassRefPtr<DocumentFragment> VTTParser::createDocumentFragmentFromCueText(Document& document, const String& cueText)
+PassRefPtrWillBeRawPtr<DocumentFragment> VTTParser::createDocumentFragmentFromCueText(Document& document, const String& cueText)
 {
     VTTTreeBuilder treeBuilder(document);
     return treeBuilder.buildFromString(cueText);
 }
 
 void VTTParser::createNewCue()
 {
     RefPtrWillBeRawPtr<VTTCue> cue = VTTCue::create(*m_document, m_currentStartTime, m_currentEndTime, m_currentContent.toString());
     cue->setId(m_currentId);
     cue->parseSettings(m_currentSettings);
@@ skipping 187 matching lines @@
     }
 }
 
 void VTTParser::trace(Visitor* visitor)
 {
     visitor->trace(m_cueList);
     visitor->trace(m_regionList);
 }
 
 }