Remove unused includes from various .cpp files in core/

Source/core/plugins/DOMMimeTypeArray.cpp

 /*
  *  Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *  Copyright (C) 2008 Apple Inc. All rights reserved.
  *
  *  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
  *  version 2 of the License, or (at your option) any later version.
  *
  *  This library is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  *  Lesser General Public License for more details.
  *
  *  You should have received a copy of the GNU Lesser General Public
  *  License along with this library; if not, write to the Free Software
  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
 #include "config.h"
 #include "core/plugins/DOMMimeTypeArray.h"
 
 #include "core/page/Frame.h"
 #include "core/page/Page.h"
-#include "core/plugins/DOMPlugin.h"
 #include "core/plugins/PluginData.h"
 #include <wtf/text/AtomicString.h>
 
 namespace WebCore {
 
 DOMMimeTypeArray::DOMMimeTypeArray(Frame* frame)
     : DOMWindowProperty(frame)
 {
     ScriptWrappable::init(this);
 }
@@ skipping 51 matching lines @@
 {
     if (!m_frame)
         return 0;
     Page* p = m_frame->page();
     if (!p)
         return 0;
     return p->pluginData();
 }
 
 } // namespace WebCore