Oilpan: make DocumentFragment a heap allocated object.

Source/core/html/HTMLElement.cpp

Index: Source/core/html/HTMLElement.cpp
diff --git a/Source/core/html/HTMLElement.cpp b/Source/core/html/HTMLElement.cpp
index c7e6eec81e8fdc6f9b10e2aff060bc58ae8fedb9..dc655abd6c04c41d4cc7e945132a7b4a16e66663 100644
--- a/Source/core/html/HTMLElement.cpp
+++ b/Source/core/html/HTMLElement.cpp
@@ -318,9 +318,9 @@ void HTMLElement::parseAttribute(const QualifiedName& name, const AtomicString&
     }
 }
 
-PassRefPtr<DocumentFragment> HTMLElement::textToFragment(const String& text, ExceptionState& exceptionState)
+PassRefPtrWillBeRawPtr<DocumentFragment> HTMLElement::textToFragment(const String& text, ExceptionState& exceptionState)
 {
-    RefPtr<DocumentFragment> fragment = DocumentFragment::create(document());
+    RefPtrWillBeRawPtr<DocumentFragment> fragment = DocumentFragment::create(document());
     unsigned i, length = text.length();
     UChar c = 0;
     for (unsigned start = 0; start < length; ) {
@@ -393,7 +393,7 @@ void HTMLElement::setInnerText(const String& text, ExceptionState& exceptionStat
     }
 
     // Add text nodes and <br> elements.
-    RefPtr<DocumentFragment> fragment = textToFragment(text, exceptionState);
+    RefPtrWillBeRawPtr<DocumentFragment> fragment = textToFragment(text, exceptionState);
     if (!exceptionState.hadException())
         replaceChildrenWithFragment(this, fragment.release(), exceptionState);
 }