Remove some dead code from html/

Source/core/html/HTMLPlugInElement.cpp

 /**
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Stefan Schimanski (1Stein@gmx.de)
  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 371 matching lines @@
         m_serviceType = mimeTypeFromDataURL(m_url);
 
     if (LocalFrame* frame = document().frame()) {
         KURL completedURL = document().completeURL(m_url);
         return frame->loader().client()->objectContentType(completedURL, m_serviceType, shouldPreferPlugInsForImages()) == ObjectContentImage;
     }
 
     return Image::supportsType(m_serviceType);
 }
 
-const String HTMLPlugInElement::loadedMimeType() const
-{
-    String mimeType = m_serviceType;
-    if (mimeType.isEmpty())
-        mimeType = mimeTypeFromURL(m_loadedUrl);
-    return mimeType;
-}
-
 RenderEmbeddedObject* HTMLPlugInElement::renderEmbeddedObject() const
 {
     // HTMLObjectElement and HTMLEmbedElement may return arbitrary renderers
     // when using fallback content.
     if (!renderer() || !renderer()->isEmbeddedObject())
         return 0;
     return toRenderEmbeddedObject(renderer());
 }
 
 // We don't use m_url, as it may not be the final URL that the object loads,
@@ skipping 152 matching lines @@
 {
     lazyReattachIfAttached();
 }
 
 bool HTMLPlugInElement::useFallbackContent() const
 {
     return hasAuthorShadowRoot();
 }
 
 }