Oilpan: make DocumentFragment a heap allocated object.

Source/core/html/HTMLTemplateElement.cpp

Index: Source/core/html/HTMLTemplateElement.cpp
diff --git a/Source/core/html/HTMLTemplateElement.cpp b/Source/core/html/HTMLTemplateElement.cpp
index f34225754c9b5d44f6e68c5b01101a3e6235cb94..577f78698620abf8618c52eaedd30062bba482f8 100644
--- a/Source/core/html/HTMLTemplateElement.cpp
+++ b/Source/core/html/HTMLTemplateElement.cpp
@@ -47,8 +47,10 @@ inline HTMLTemplateElement::HTMLTemplateElement(Document& document)
 
 HTMLTemplateElement::~HTMLTemplateElement()
 {
+#if !ENABLE(OILPAN)
     if (m_content)
         m_content->clearHost();
+#endif
 }
 
 PassRefPtrWillBeRawPtr<HTMLTemplateElement> HTMLTemplateElement::create(Document& document)
@@ -83,4 +85,10 @@ void HTMLTemplateElement::didMoveToNewDocument(Document& oldDocument)
     document().ensureTemplateDocument().adoptIfNeeded(*m_content);
 }
 
+void HTMLTemplateElement::trace(Visitor* visitor)
+{
+    visitor->trace(m_content);
+    HTMLElement::trace(visitor);
+}
+
 } // namespace WebCore