Don't dispatch events when XHR is set to sync mode

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 65 matching lines @@
         ResponseTypeArrayBuffer,
         ResponseTypeStream
     };
 
     enum DropProtection {
         DropProtectionSync,
         DropProtectionAsync,
     };
 
     virtual void contextDestroyed();
-    virtual void didTimeout();
     virtual bool canSuspend() const;
     virtual void suspend(ReasonForSuspension);
     virtual void resume();
     virtual void stop();
 
     virtual const AtomicString& interfaceName() const OVERRIDE;
     virtual ScriptExecutionContext* scriptExecutionContext() const OVERRIDE;
 
     const KURL& url() const { return m_url; }
     String statusText(ExceptionState&) const;
@@ skipping 69 matching lines @@
     bool responseIsXML() const;
 
     bool areMethodAndURLValidForSend();
 
     bool initSend(ExceptionState&);
     void sendBytesData(const void*, size_t, ExceptionState&);
 
     String getRequestHeader(const AtomicString& name) const;
     void setRequestHeaderInternal(const AtomicString& name, const String& value);
 
+    // Changes m_state and dispatches a readyStateChange event if new m_state
+    // value is different from last one.
     void changeState(State newState);
     void callReadyStateChangeListener();
     void dropProtectionSoon();
     void dropProtection(Timer<XMLHttpRequest>* = 0);
     void internalAbort(DropProtection = DropProtectionSync);
     void clearResponse();
     void clearResponseBuffers();
     void clearRequest();
 
     void createRequest(ExceptionState&);
 
-    void genericError();
-    void networkError();
-    void abortError();
+    // Dispatches an event of the specified type to m_upload and
+    // m_progressEventThrottle.
+    void dispatchEventAndLoadEnd(const AtomicString&);
+    // Does clean up common for all kind of didFail() call.
+    void handleDidFailGeneric();
+    // Handles didFail() call not caused by cancellation or timeout.
+    void handleNetworkError();
+    // Handles didFail() call triggered by m_loader->cancel().
+    void handleDidCancel();
+    // Handles didFail() call for timeout.
+    void handleDidTimeout();
 
     OwnPtr<XMLHttpRequestUpload> m_upload;
 
     KURL m_url;
     String m_method;
     HTTPHeaderMap m_requestHeaders;
     RefPtr<FormData> m_requestEntityBody;
     String m_mimeTypeOverride;
     bool m_async;
     bool m_includeCredentials;
@@ skipping 22 matching lines @@
     bool m_uploadComplete;
 
     bool m_sameOriginRequest;
     bool m_allowCrossOriginRequests;
 
     // Used for onprogress tracking
     long long m_receivedLength;
 
     unsigned m_lastSendLineNumber;
     String m_lastSendURL;
+    // An exception to throw in synchronous mode. It's set when failure
+    // notification is received from m_loader and thrown at the end of send() if
+    // any.
     ExceptionCode m_exceptionCode;
 
     XMLHttpRequestProgressEventThrottle m_progressEventThrottle;
 
     // An enum corresponding to the allowed string values for the responseType attribute.
     ResponseTypeCode m_responseTypeCode;
     Timer<XMLHttpRequest> m_protectionTimer;
     RefPtr<SecurityOrigin> m_securityOrigin;
 };
 
 } // namespace WebCore
 
 #endif // XMLHttpRequest_h