Use enum BinaryType for WebSocket.binaryType, instead of DOMString

Source/modules/websockets/DOMWebSocket.cpp

 /*
  * Copyright (C) 2011 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 534 matching lines @@
 void DOMWebSocket::setBinaryType(const String& binaryType)
 {
     if (binaryType == "blob") {
         m_binaryType = BinaryTypeBlob;
         return;
     }
     if (binaryType == "arraybuffer") {
         m_binaryType = BinaryTypeArrayBuffer;
         return;
     }
-    logError("'" + binaryType + "' is not a valid value for binaryType; binaryType remains unchanged.");
+    ASSERT_NOT_REACHED();
 }
 
 const AtomicString& DOMWebSocket::interfaceName() const
 {
     return EventTargetNames::DOMWebSocket;
 }
 
 ExecutionContext* DOMWebSocket::executionContext() const
 {
     return ActiveDOMObject::executionContext();
@@ skipping 118 matching lines @@
 DEFINE_TRACE(DOMWebSocket)
 {
     visitor->trace(m_channel);
     visitor->trace(m_eventQueue);
     WebSocketChannelClient::trace(visitor);
     RefCountedGarbageCollectedEventTargetWithInlineData<DOMWebSocket>::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink