Sync the WebSocket interface with the spec

Source/modules/websockets/DocumentWebSocketChannel.cpp

 /*
  * Copyright (C) 2013 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 250 matching lines @@
         InspectorInstrumentation::didCloseWebSocket(document(), m_identifier);
     }
     abortAsyncOperations();
     m_handle.clear();
     m_client = nullptr;
     m_identifier = 0;
 }
 
 DocumentWebSocketChannel::Message::Message(const String& text)
     : type(MessageTypeText)
-    , text(text.utf8(StrictUTF8ConversionReplacingUnpairedSurrogatesWithFFFD)) { }
+    , text(text.utf8()) { }
 
 DocumentWebSocketChannel::Message::Message(PassRefPtr<BlobDataHandle> blobDataHandle)
     : type(MessageTypeBlob)
     , blobDataHandle(blobDataHandle) { }
 
 DocumentWebSocketChannel::Message::Message(PassRefPtr<DOMArrayBuffer> arrayBuffer)
     : type(MessageTypeArrayBuffer)
     , arrayBuffer(arrayBuffer) { }
 
 DocumentWebSocketChannel::Message::Message(PassOwnPtr<Vector<char>> vectorData)
@@ skipping 302 matching lines @@
 
 DEFINE_TRACE(DocumentWebSocketChannel)
 {
     visitor->trace(m_blobLoader);
     visitor->trace(m_client);
     WebSocketChannel::trace(visitor);
     ContextLifecycleObserver::trace(visitor);
 }
 
 } // namespace blink