IDL: make optional arguments (without default) explicit sometimes

Source/modules/websockets/DOMWebSocket.h

Index: Source/modules/websockets/DOMWebSocket.h
diff --git a/Source/modules/websockets/DOMWebSocket.h b/Source/modules/websockets/DOMWebSocket.h
index 4123e1602a4b41367e5125b2986af4cd0033de87..591ee85ac524a23b0b7146ce898675eafd98a281 100644
--- a/Source/modules/websockets/DOMWebSocket.h
+++ b/Source/modules/websockets/DOMWebSocket.h
@@ -31,6 +31,7 @@
 #ifndef DOMWebSocket_h
 #define DOMWebSocket_h
 
+#include "bindings/core/v8/Optional.h"
 #include "core/dom/ActiveDOMObject.h"
 #include "core/events/EventListener.h"
 #include "modules/EventTargetModules.h"
@@ -56,7 +57,6 @@ public:
     // DOMWebSocket instances must be used with a wrapper since this class's
     // lifetime management is designed assuming the V8 holds a ref on it while
     // hasPendingActivity() returns true.
-    static DOMWebSocket* create(ExecutionContext*, const String& url, ExceptionState&);
     static DOMWebSocket* create(ExecutionContext*, const String& url, const String& protocol, ExceptionState&);
     static DOMWebSocket* create(ExecutionContext*, const String& url, const Vector<String>& protocols, ExceptionState&);
     virtual ~DOMWebSocket();
@@ -75,14 +75,7 @@ public:
     void send(ArrayBufferView*, ExceptionState&);
     void send(Blob*, ExceptionState&);
 
-    // To distinguish close method call with the code parameter from one
-    // without, we have these three signatures. Use of
-    // Optional=DefaultIsUndefined in the IDL file doesn't help for now since
-    // it's bound to a value of 0 which is indistinguishable from the case 0
-    // is passed as code parameter.
-    void close(unsigned short code, const String& reason, ExceptionState&);
-    void close(ExceptionState&);
-    void close(unsigned short code, ExceptionState&);
+    void close(Optional<unsigned short> code, const String& reason, ExceptionState&);
 
     const KURL& url() const;
     State readyState() const;