[WebSocket] Merge duplicated HTTP headers for devtools

Source/platform/network/WebSocketHandshakeResponse.cpp

 /*
  * Copyright (C) 2010 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 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "platform/network/WebSocketHandshakeResponse.h"
 
+#include "platform/network/WebSocketHandshakeRequest.h"
 #include "wtf/Assertions.h"
 #include "wtf/text/AtomicString.h"
 
 namespace WebCore {
 
 WebSocketHandshakeResponse::WebSocketHandshakeResponse()
 {
 }
 
 WebSocketHandshakeResponse::~WebSocketHandshakeResponse()
@@ skipping 21 matching lines @@
     m_statusText = statusText;
 }
 
 const HTTPHeaderMap& WebSocketHandshakeResponse::headerFields() const
 {
     return m_headerFields;
 }
 
 void WebSocketHandshakeResponse::addHeaderField(const AtomicString& name, const AtomicString& value)
 {
-    m_headerFields.add(name, value);
+    WebSocketHandshakeRequest::addAndMergeHeader(&m_headerFields, name, value);
 }
 
 void WebSocketHandshakeResponse::clearHeaderFields()
 {
     m_headerFields.clear();
 }
 
 } // namespace WebCore