MIME type predicates and case-insensitive matching.

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 1168 matching lines @@
             mimeType = m_response.mimeType();
     }
     if (mimeType.isEmpty())
         mimeType = AtomicString("text/xml", AtomicString::ConstructFromLiteral);
 
     return mimeType;
 }
 
 bool XMLHttpRequest::responseIsXML() const
 {
-    // FIXME: Remove the lower() call when DOMImplementation.isXMLMIMEType() is modified
-    //        to do case insensitive MIME type matching.
-    return DOMImplementation::isXMLMIMEType(responseMIMEType().lower());
+    return DOMImplementation::isXMLMIMEType(responseMIMEType());
 }
 
 int XMLHttpRequest::status() const
 {
     if (m_state == UNSENT || m_state == OPENED || m_error)
         return 0;
 
     if (m_response.httpStatusCode())
         return m_response.httpStatusCode();
 
@@ skipping 221 matching lines @@
 {
     return EventTargetNames::XMLHttpRequest;
 }
 
 ExecutionContext* XMLHttpRequest::executionContext() const
 {
     return ActiveDOMObject::executionContext();
 }
 
 } // namespace WebCore