Oilpan: move core/fileapi to oilpan's heap.

Source/core/xml/XMLHttpRequest.h

 /*
  *  Copyright (C) 2003, 2006, 2008 Apple Inc. All rights reserved.
  *  Copyright (C) 2005, 2006 Alexey Proskuryakov <ap@nypop.com>
  *  Copyright (C) 2011 Google Inc. All rights reserved.
  *  Copyright (C) 2012 Intel Corporation
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser General Public
  *  License as published by the Free Software Foundation; either
  *  version 2 of the License, or (at your option) any later version.
@@ skipping 126 matching lines @@
     // response attribute has custom getter.
     ArrayBuffer* responseArrayBuffer();
 
     void setLastSendLineNumber(unsigned lineNumber) { m_lastSendLineNumber = lineNumber; }
     void setLastSendURL(const String& url) { m_lastSendURL = url; }
 
     XMLHttpRequestUpload* upload();
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(readystatechange);
 
-    void trace(Visitor*) { }
+    void trace(Visitor*);
 
 private:
     XMLHttpRequest(ExecutionContext*, PassRefPtr<SecurityOrigin>);
 
     Document* document() const;
     SecurityOrigin* securityOrigin() const;
 
     virtual void didSendData(unsigned long long bytesSent, unsigned long long totalBytesToBeSent) OVERRIDE;
     virtual void didReceiveResponse(unsigned long identifier, const ResourceResponse&) OVERRIDE;
     virtual void didReceiveData(const char* data, int dataLength) OVERRIDE;
@@ skipping 57 matching lines @@
     OwnPtr<XMLHttpRequestUpload> m_upload;
 
     KURL m_url;
     AtomicString m_method;
     HTTPHeaderMap m_requestHeaders;
     RefPtr<FormData> m_requestEntityBody;
     AtomicString m_mimeTypeOverride;
     bool m_async;
     bool m_includeCredentials;
     unsigned long m_timeoutMilliseconds;
-    RefPtr<Blob> m_responseBlob;
-    RefPtr<Stream> m_responseStream;
+    RefPtrWillBeMember<Blob> m_responseBlob;
+    RefPtrWillBeMember<Stream> m_responseStream;
 
     RefPtr<ThreadableLoader> m_loader;
     State m_state;
 
     ResourceResponse m_response;
     String m_responseEncoding;
 
     OwnPtr<TextResourceDecoder> m_decoder;
 
     ScriptString m_responseText;
@@ skipping 27 matching lines @@
 
     // An enum corresponding to the allowed string values for the responseType attribute.
     ResponseTypeCode m_responseTypeCode;
     AsyncMethodRunner<XMLHttpRequest> m_dropProtectionRunner;
     RefPtr<SecurityOrigin> m_securityOrigin;
 };
 
 } // namespace WebCore
 
 #endif // XMLHttpRequest_h