Remove unused includes from core/{editing,fileapi,history,html}

Source/core/html/track/TextTrackCueGeneric.h

 /*
  * Copyright (C) 2013 Apple 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 10 matching lines @@
  * 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.
  */
 
 #ifndef TextTrackCueGeneric_h
 #define TextTrackCueGeneric_h
 
 #include "core/html/track/TextTrackCue.h"
 #include "core/platform/graphics/Color.h"
-#include <wtf/RefCounted.h>
 
 namespace WebCore {
 
 class GenericCueData;
 
 // A "generic" cue is a non-WebVTT cue, so it is not positioned/sized with the WebVTT logic.
 class TextTrackCueGeneric : public TextTrackCue {
 public:
     static PassRefPtr<TextTrackCueGeneric> create(ScriptExecutionContext* context, double start, double end, const String& content)
     {
@@ skipping 41 matching lines @@
     Color m_backgroundColor;
     double m_baseFontSizeRelativeToVideoHeight;
     double m_fontSizeMultiplier;
     String m_fontName;
     bool m_defaultPosition;
 };
 
 } // namespace WebCore
 
 #endif