Remove duplicated headers from core/

Source/core/platform/chromium/ChromiumDataObjectItem.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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 16 matching lines @@
  * (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 "core/platform/chromium/ChromiumDataObjectItem.h"
 
 #include "core/dom/DataTransferItem.h"
 #include "core/dom/StringCallback.h"
 #include "core/fileapi/Blob.h"
-#include "core/fileapi/File.h"
 #include "core/platform/Pasteboard.h"
-#include "platform/SharedBuffer.h"
 #include "platform/clipboard/ClipboardMimeTypes.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebClipboard.h"
 
 namespace WebCore {
 
 PassRefPtr<ChromiumDataObjectItem> ChromiumDataObjectItem::createFromString(const String& type, const String& data)
 {
     RefPtr<ChromiumDataObjectItem> item = adoptRef(new ChromiumDataObjectItem(DataTransferItem::kindString, type));
     item->m_data = data;
@@ skipping 126 matching lines @@
 
 bool ChromiumDataObjectItem::isFilename() const
 {
     // FIXME: https://bugs.webkit.org/show_bug.cgi?id=81261: When we properly support File dragout,
     // we'll need to make sure this works as expected for DragDataChromium.
     return m_kind == DataTransferItem::kindFile && m_file;
 }
 
 } // namespace WebCore