Remove duplicated headers

Source/web/WebIDBDatabaseCallbacksImpl.cpp

 /*
  * Copyright (C) 2011 Google Inc. 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 10 matching lines @@
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "WebIDBDatabaseCallbacksImpl.h"
 
 #include "core/dom/DOMError.h"
 #include "modules/indexeddb/IDBDatabaseCallbacks.h"
-#include "public/platform/WebString.h"
 
 using namespace WebCore;
 
 namespace blink {
 
 WebIDBDatabaseCallbacksImpl::WebIDBDatabaseCallbacksImpl(PassRefPtr<IDBDatabaseCallbacks> callbacks)
     : m_callbacks(callbacks)
 {
 }
 
@@ skipping 15 matching lines @@
 {
     m_callbacks->onAbort(transactionId, error);
 }
 
 void WebIDBDatabaseCallbacksImpl::onComplete(long long transactionId)
 {
     m_callbacks->onComplete(transactionId);
 }
 
 } // namespace blink