Oilpan: use transition types for remaining RefPtr<Document>s in dom/.

Source/core/dom/Range.h

Index: Source/core/dom/Range.h
diff --git a/Source/core/dom/Range.h b/Source/core/dom/Range.h
index 9205eaf1397b7c5a4cd58d083245874438331659..276295db6079209ee6807912563dc0f5157e02cd 100644
--- a/Source/core/dom/Range.h
+++ b/Source/core/dom/Range.h
@@ -164,7 +164,7 @@ private:
     enum ContentsProcessDirection { ProcessContentsForward, ProcessContentsBackward };
     static PassRefPtr<Node> processAncestorsAndTheirSiblings(ActionType, Node* container, ContentsProcessDirection, PassRefPtr<Node> clonedContainer, Node* commonRoot, ExceptionState&);
 
-    RefPtr<Document> m_ownerDocument; // Cannot be null.
+    RefPtrWillBeMember<Document> m_ownerDocument; // Cannot be null.
     RangeBoundaryPoint m_start;
     RangeBoundaryPoint m_end;
 };