Implemented Document.contentType

Source/core/xml/XMLHttpRequest.cpp

 /*
  *  Copyright (C) 2004, 2006, 2008 Apple Inc. All rights reserved.
  *  Copyright (C) 2005-2007 Alexey Proskuryakov <ap@webkit.org>
  *  Copyright (C) 2007, 2008 Julien Chaffraix <jchaffraix@webkit.org>
  *  Copyright (C) 2008, 2011 Google Inc. All rights reserved.
  *  Copyright (C) 2012 Intel Corporation
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser General Public
  *  License as published by the Free Software Foundation; either
@@ skipping 224 matching lines @@
 {
     if (m_responseTypeCode != ResponseTypeDefault && m_responseTypeCode != ResponseTypeDocument) {
         exceptionState.throwDOMException(InvalidStateError, "The value is only accessible if the object's 'responseType' is '' or 'document' (was '" + responseType() + "').");
         return 0;
     }
 
     if (m_error || m_state != DONE)
         return 0;
 
     if (!m_createdDocument) {
-        bool isHTML = equalIgnoringCase(responseMIMEType(), "text/html");
+        AtomicString mimeType = responseMIMEType();
+        bool isHTML = equalIgnoringCase(mimeType, "text/html");
 
         // The W3C spec requires the final MIME type to be some valid XML type, or text/html.
         // If it is text/html, then the responseType of "document" must have been supplied explicitly.
         if ((m_response.isHTTP() && !responseIsXML() && !isHTML)
             || (isHTML && m_responseTypeCode == ResponseTypeDefault)
             || executionContext()->isWorkerGlobalScope()) {
             m_responseDocument = nullptr;
         } else {
             DocumentInit init = DocumentInit::fromContext(document()->contextDocument(), m_url);
             if (isHTML)
                 m_responseDocument = HTMLDocument::create(init);
             else
                 m_responseDocument = XMLDocument::create(init);
             // FIXME: Set Last-Modified.
             m_responseDocument->setContent(m_responseText.flattenToString());
             m_responseDocument->setSecurityOrigin(securityOrigin());
             m_responseDocument->setContextFeatures(document()->contextFeatures());
+            m_responseDocument->setMimeType(mimeType);
             if (!m_responseDocument->wellFormed())
                 m_responseDocument = nullptr;
         }
         m_createdDocument = true;
     }
 
     return m_responseDocument.get();
 }
 
 Blob* XMLHttpRequest::responseBlob()
@@ skipping 1116 matching lines @@
     return ActiveDOMObject::executionContext();
 }
 
 void XMLHttpRequest::trace(Visitor* visitor)
 {
     visitor->trace(m_responseBlob);
     visitor->trace(m_responseStream);
 }
 
 } // namespace WebCore