Use null Strings for default values of MessageEvent properties

Source/core/dom/MessageEvent.h

 /*
  * Copyright (C) 2007 Henry Mason (hmason@mac.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 35 matching lines @@
     RefPtr<EventTarget> source;
     MessagePortArray ports;
 };
 
 class MessageEvent : public Event {
 public:
     static PassRefPtr<MessageEvent> create()
     {
         return adoptRef(new MessageEvent);
     }
-    static PassRefPtr<MessageEvent> create(PassOwnPtr<MessagePortArray> ports, const String& origin = "", const String& lastEventId = "", PassRefPtr<EventTarget> source = 0)
+    static PassRefPtr<MessageEvent> create(PassOwnPtr<MessagePortArray> ports, const String& origin = String(), const String& lastEventId = String(), PassRefPtr<EventTarget> source = 0)
     {
         return adoptRef(new MessageEvent(origin, lastEventId, source, ports));
     }
-    static PassRefPtr<MessageEvent> create(PassOwnPtr<MessagePortArray> ports, PassRefPtr<SerializedScriptValue> data, const String& origin = "", const String& lastEventId = "", PassRefPtr<EventTarget> source = 0)
+    static PassRefPtr<MessageEvent> create(PassOwnPtr<MessagePortArray> ports, PassRefPtr<SerializedScriptValue> data, const String& origin = String(), const String& lastEventId = String(), PassRefPtr<EventTarget> source = 0)
     {
         return adoptRef(new MessageEvent(data, origin, lastEventId, source, ports));
     }
-    static PassRefPtr<MessageEvent> create(const String& data, const String& origin = "")
+    static PassRefPtr<MessageEvent> create(const String& data, const String& origin = String())
     {
         return adoptRef(new MessageEvent(data, origin));
     }
-    static PassRefPtr<MessageEvent> create(PassRefPtr<Blob> data, const String& origin = "")
+    static PassRefPtr<MessageEvent> create(PassRefPtr<Blob> data, const String& origin = String())
     {
         return adoptRef(new MessageEvent(data, origin));
     }
-    static PassRefPtr<MessageEvent> create(PassRefPtr<ArrayBuffer> data, const String& origin = "")
+    static PassRefPtr<MessageEvent> create(PassRefPtr<ArrayBuffer> data, const String& origin = String())
     {
         return adoptRef(new MessageEvent(data, origin));
     }
     static PassRefPtr<MessageEvent> create(const AtomicString& type, const MessageEventInit& initializer)
     {
         return adoptRef(new MessageEvent(type, initializer));
     }
     virtual ~MessageEvent();
 
     void initMessageEvent(const AtomicString& type, bool canBubble, bool cancelable, const String& origin, const String& lastEventId, DOMWindow* source, PassOwnPtr<MessagePortArray>);
@@ skipping 42 matching lines @@
     RefPtr<ArrayBuffer> m_dataAsArrayBuffer;
     String m_origin;
     String m_lastEventId;
     RefPtr<EventTarget> m_source;
     OwnPtr<MessagePortArray> m_ports;
 };
 
 } // namespace WebCore
 
 #endif // MessageEvent_h