Remove m_requestEntityBody from XMLHttpRequest

Source/core/xml/XMLHttpRequest.h

Index: Source/core/xml/XMLHttpRequest.h
diff --git a/Source/core/xml/XMLHttpRequest.h b/Source/core/xml/XMLHttpRequest.h
index 98d4c3b3150750f77d0fe3e17e6f0240ffa7445d..a6227e21df7209ead0aebd029c98b0708aacf9c0 100644
--- a/Source/core/xml/XMLHttpRequest.h
+++ b/Source/core/xml/XMLHttpRequest.h
@@ -191,7 +191,7 @@ private:
     void clearResponse();
     void clearRequest();
 
-    void createRequest(ExceptionState&);
+    void createRequest(PassRefPtr<FormData>, ExceptionState&);
 
     // Dispatches a response ProgressEvent.
     void dispatchProgressEvent(const AtomicString&, long long, long long);
@@ -215,7 +215,6 @@ private:
     KURL m_url;
     AtomicString m_method;
     HTTPHeaderMap m_requestHeaders;
-    RefPtr<FormData> m_requestEntityBody;
     AtomicString m_mimeTypeOverride;
     bool m_async;
     bool m_includeCredentials;