[XHR] Use hasPendingActivity() to manage XHR's life time.

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 12 matching lines @@
 #define XMLHttpRequest_h
 
 #include "bindings/v8/ScriptString.h"
 #include "bindings/v8/ScriptWrappable.h"
 #include "core/dom/ActiveDOMObject.h"
 #include "core/events/EventListener.h"
 #include "core/events/ThreadLocalEventNames.h"
 #include "core/loader/ThreadableLoaderClient.h"
 #include "core/xml/XMLHttpRequestEventTarget.h"
 #include "core/xml/XMLHttpRequestProgressEventThrottle.h"
-#include "platform/AsyncMethodRunner.h"
 #include "platform/network/FormData.h"
 #include "platform/network/ResourceResponse.h"
 #include "platform/weborigin/SecurityOrigin.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/text/AtomicStringHash.h"
 #include "wtf/text/StringBuilder.h"
 
 namespace WebCore {
 
 class Blob;
@@ skipping 28 matching lines @@
     enum ResponseTypeCode {
         ResponseTypeDefault,
         ResponseTypeText,
         ResponseTypeJSON,
         ResponseTypeDocument,
         ResponseTypeBlob,
         ResponseTypeArrayBuffer,
         ResponseTypeStream
     };
 
-    enum DropProtection {
-        DropProtectionSync,
-        DropProtectionAsync,
-    };
-
-    virtual void contextDestroyed();
-    virtual void suspend();
-    virtual void resume();
-    virtual void stop();
+    // ActiveDOMObject implementaions
+    virtual void contextDestroyed() OVERRIDE;
+    // Keep the JavaScript wrapper alive while a request is in progress so that
+    // this object (which is a listener for m_loader) is also kept alive.
+    virtual bool hasPendingActivity() const OVERRIDE;
+    virtual void suspend() OVERRIDE;
+    virtual void resume() OVERRIDE;
+    virtual void stop() OVERRIDE;
 
     virtual const AtomicString& interfaceName() const OVERRIDE;
     virtual ExecutionContext* executionContext() const OVERRIDE;
 
     const KURL& url() const { return m_url; }
     String statusText(ExceptionState&) const;
     int status(ExceptionState&) const;
     State readyState() const;
     bool withCredentials() const { return m_includeCredentials; }
     void setWithCredentials(bool, ExceptionState&);
@@ skipping 64 matching lines @@
     void sendBytesData(const void*, size_t, ExceptionState&);
 
     AtomicString getRequestHeader(const AtomicString& name) const;
     void setRequestHeaderInternal(const AtomicString& name, const AtomicString& value);
 
     // Changes m_state and dispatches a readyStateChange event if new m_state
     // value is different from last one.
     void changeState(State newState);
     void dispatchReadyStateChangeEvent();
 
-    void dropProtectionSoon();
-    void dropProtection();
     // Clears variables used only while the resource is being loaded.
     void clearVariablesForLoading();
     // Returns false iff reentry happened and a new load is started.
-    bool internalAbort(DropProtection = DropProtectionSync);
+    bool internalAbort();
     // Clears variables holding response header and body data.
     void clearResponse();
     void clearRequest();
 
     void createRequest(ExceptionState&);
 
     // Dispatches an event of the specified type to m_progressEventThrottle.
     void dispatchEventAndLoadEnd(const AtomicString&, long long, long long);
 
     // Dispatches a response progress event to m_progressEventThrottle.
@@ skipping 58 matching lines @@
     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;
-    AsyncMethodRunner<XMLHttpRequest> m_dropProtectionRunner;
     RefPtr<SecurityOrigin> m_securityOrigin;
 };
 
 } // namespace WebCore
 
 #endif // XMLHttpRequest_h