Oilpan: make DocumentFragment a heap allocated object.

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

 /*
  * Copyright (c) 2013, Opera Software ASA. 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 417 matching lines @@
         if (node->isVTTElement())
             clonedNode = toVTTElement(node)->createEquivalentHTMLElement(document());
         else
             clonedNode = node->cloneNode(false);
         parent->appendChild(clonedNode);
         if (node->isContainerNode())
             copyVTTNodeToDOMTree(toContainerNode(node), toContainerNode(clonedNode));
     }
 }
 
-PassRefPtr<DocumentFragment> VTTCue::getCueAsHTML()
+PassRefPtrWillBeRawPtr<DocumentFragment> VTTCue::getCueAsHTML()
 {
     createVTTNodeTree();
-    RefPtr<DocumentFragment> clonedFragment = DocumentFragment::create(document());
+    RefPtrWillBeRawPtr<DocumentFragment> clonedFragment = DocumentFragment::create(document());
     copyVTTNodeToDOMTree(m_vttNodeTree.get(), clonedFragment.get());
     return clonedFragment.release();
 }
 
-PassRefPtr<DocumentFragment> VTTCue::createCueRenderingTree()
+PassRefPtrWillBeRawPtr<DocumentFragment> VTTCue::createCueRenderingTree()
 {
-    RefPtr<DocumentFragment> clonedFragment;
     createVTTNodeTree();
-    clonedFragment = DocumentFragment::create(document());
+    RefPtrWillBeRawPtr<DocumentFragment> clonedFragment = DocumentFragment::create(document());
     m_vttNodeTree->cloneChildNodes(clonedFragment.get());
     return clonedFragment.release();
 }
 
 void VTTCue::setRegionId(const String& regionId)
 {
     if (m_regionId == regionId)
         return;
 
     cueWillChange();
@@ skipping 244 matching lines @@
     // The display tree may contain WebVTT timestamp objects representing
     // timestamps (processing instructions), along with displayable nodes.
 
     if (!track()->isRendered())
         return;
 
     // Clear the contents of the set.
     m_cueBackgroundBox->removeChildren();
 
     // Update the two sets containing past and future WebVTT objects.
-    RefPtr<DocumentFragment> referenceTree = createCueRenderingTree();
+    RefPtrWillBeRawPtr<DocumentFragment> referenceTree = createCueRenderingTree();
     markFutureAndPastNodes(referenceTree.get(), startTime(), movieTime);
     m_cueBackgroundBox->appendChild(referenceTree, ASSERT_NO_EXCEPTION);
 }
 
 PassRefPtrWillBeRawPtr<VTTCueBox> VTTCue::getDisplayTree(const IntSize& videoSize)
 {
     RefPtrWillBeRawPtr<VTTCueBox> displayTree(ensureDisplayTree());
     if (!m_displayTreeShouldChange || !track()->isRendered())
         return displayTree.release();
 
@@ skipping 373 matching lines @@
 
 void VTTCue::trace(Visitor* visitor)
 {
     visitor->trace(m_vttNodeTree);
     visitor->trace(m_cueBackgroundBox);
     visitor->trace(m_displayTree);
     TextTrackCue::trace(visitor);
 }
 
 } // namespace WebCore