Oilpan: Replace RefPtrs to Document in core/{accessibility,animation,fetch} with Oilpan transition …

Source/core/fetch/DocumentResource.h

Index: Source/core/fetch/DocumentResource.h
diff --git a/Source/core/fetch/DocumentResource.h b/Source/core/fetch/DocumentResource.h
index b12dbfb6d3f1c15eba250e8200a35277c73a684d..6ded9f721a68b27d02609191e6e78d237de43d66 100644
--- a/Source/core/fetch/DocumentResource.h
+++ b/Source/core/fetch/DocumentResource.h
@@ -46,9 +46,9 @@ public:
     virtual void checkNotify() OVERRIDE;
 
 private:
-    PassRefPtr<Document> createDocument(const KURL&);
+    PassRefPtrWillBeRawPtr<Document> createDocument(const KURL&);
 
-    RefPtr<Document> m_document;
+    RefPtrWillBePersistent<Document> m_document;
     OwnPtr<TextResourceDecoder> m_decoder;
 };