WebSocket must not be established when subprotocol is not selected by the server

Source/modules/websockets/WebSocketHandshake.cpp

 /*
  * Copyright (C) 2011 Google Inc.  All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 530 matching lines @@
         if (m_clientProtocol.isEmpty()) {
             m_failureReason = "Error during WebSocket handshake: Sec-WebSocket-Protocol mismatch";
             return false;
         }
         Vector<String> result;
         m_clientProtocol.split(String(WebSocket::subProtocolSeperator()), result);
         if (!result.contains(serverWebSocketProtocol)) {
             m_failureReason = "Error during WebSocket handshake: Sec-WebSocket-Protocol mismatch";
             return false;
         }
+    } else if (!m_clientProtocol.isEmpty()) {
+        m_failureReason = "Error during WebSocket handshake: Sec-WebSocket-Protocol mismatch";
+        return false;
     }
     return true;
 }
 
 } // namespace WebCore