Remove PlatformMouseEvent::m_modifierFlags member.

Source/core/page/Chrome.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * Copyright (C) 2012, Samsung Electronics. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 91 matching lines @@
 
     void closeWindowSoon();
 
     void runJavaScriptAlert(LocalFrame*, const String&);
     bool runJavaScriptConfirm(LocalFrame*, const String&);
     bool runJavaScriptPrompt(LocalFrame*, const String& message, const String& defaultValue, String& result);
     void setStatusbarText(LocalFrame*, const String&);
 
     IntRect windowResizerRect() const;
 
-    void mouseDidMoveOverElement(const HitTestResult&, unsigned modifierFlags);
+    void mouseDidMoveOverElement(const HitTestResult&);
 
     void setToolTip(const HitTestResult&);
 
     void print(LocalFrame*);
 
     PassOwnPtrWillBeRawPtr<ColorChooser> createColorChooser(LocalFrame*, ColorChooserClient*, const Color& initialColor);
     PassRefPtr<DateTimeChooser> openDateTimeChooser(DateTimeChooserClient*, const DateTimeChooserParameters&);
     void openTextDataListChooser(HTMLInputElement&);
 
     void runOpenPanel(LocalFrame*, PassRefPtr<FileChooser>);
@@ skipping 14 matching lines @@
     void notifyPopupOpeningObservers() const;
 
     Page* m_page;
     ChromeClient* m_client;
     Vector<PopupOpeningObserver*> m_popupOpeningObservers;
 };
 
 } // namespace blink
 
 #endif // Chrome_h