Clean up redundant header files in navigatorcontentutils

Source/modules/navigatorcontentutils/NavigatorContentUtils.h

 /*
  * Copyright (C) 2011, Google Inc. All rights reserved.
  * Copyright (C) 2012, Samsung Electronics. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 12 matching lines @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  * DAMAGE.
  */
 
 #ifndef NavigatorContentUtils_h
 #define NavigatorContentUtils_h
 
 #include "modules/navigatorcontentutils/NavigatorContentUtilsClient.h"
 #include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
+#include "wtf/OwnPtr.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 class ExceptionState;
 class Navigator;
 class Page;
 
 class NavigatorContentUtils FINAL : public NoBaseWillBeGarbageCollectedFinalized<NavigatorContentUtils>, public WillBeHeapSupplement<Page> {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(NavigatorContentUtils);
@@ skipping 19 matching lines @@
     { }
 
     NavigatorContentUtilsClient* client() { return m_client.get(); }
 
     OwnPtr<NavigatorContentUtilsClient> m_client;
 };
 
 } // namespace WebCore
 
 #endif // NavigatorContentUtils_h