Oilpan: make DocumentFragment a heap allocated object.

Source/core/editing/ReplaceSelectionCommand.cpp

Index: Source/core/editing/ReplaceSelectionCommand.cpp
diff --git a/Source/core/editing/ReplaceSelectionCommand.cpp b/Source/core/editing/ReplaceSelectionCommand.cpp
index 73a0b7d5a99fd0c231c5b2046e46c849207a0abd..c79bc1008c3f2d7717450100356ceea02d792893 100644
--- a/Source/core/editing/ReplaceSelectionCommand.cpp
+++ b/Source/core/editing/ReplaceSelectionCommand.cpp
@@ -63,8 +63,9 @@ enum EFragmentType { EmptyFragment, SingleTextNodeFragment, TreeFragment };
 
 // --- ReplacementFragment helper class
 
-class ReplacementFragment {
+class ReplacementFragment FINAL {
     WTF_MAKE_NONCOPYABLE(ReplacementFragment);
+    STACK_ALLOCATED();
 public:
     ReplacementFragment(Document*, DocumentFragment*, const VisibleSelection&);
 
@@ -87,8 +88,8 @@ private:
 
     void insertNodeBefore(PassRefPtr<Node> node, Node* refNode);
 
-    RefPtr<Document> m_document;
-    RefPtr<DocumentFragment> m_fragment;
+    RefPtrWillBeMember<Document> m_document;
+    RefPtrWillBeMember<DocumentFragment> m_fragment;
     bool m_hasInterchangeNewlineAtStart;
     bool m_hasInterchangeNewlineAtEnd;
 };
@@ -355,7 +356,7 @@ inline void ReplaceSelectionCommand::InsertedNodes::didReplaceNode(Node& node, N
         m_lastNodeInserted = &newNode;
 }
 
-ReplaceSelectionCommand::ReplaceSelectionCommand(Document& document, PassRefPtr<DocumentFragment> fragment, CommandOptions options, EditAction editAction)
+ReplaceSelectionCommand::ReplaceSelectionCommand(Document& document, PassRefPtrWillBeRawPtr<DocumentFragment> fragment, CommandOptions options, EditAction editAction)
     : CompositeEditCommand(document)
     , m_selectReplacement(options & SelectReplacement)
     , m_smartReplace(options & SmartReplace)