Remove PlatformMouseEvent::m_modifierFlags member.

Source/core/page/Chrome.cpp

 /*
  * Copyright (C) 2006, 2007, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 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 259 matching lines @@
 {
     ASSERT(frame);
     m_client->setStatusbarText(status);
 }
 
 IntRect Chrome::windowResizerRect() const
 {
     return m_client->windowResizerRect();
 }
 
-void Chrome::mouseDidMoveOverElement(const HitTestResult& result, unsigned modifierFlags)
+void Chrome::mouseDidMoveOverElement(const HitTestResult& result)
 {
     if (result.innerNode()) {
         if (result.innerNode()->document().isDNSPrefetchEnabled())
             prefetchDNS(result.absoluteLinkURL().host());
     }
-    m_client->mouseDidMoveOverElement(result, modifierFlags);
+    m_client->mouseDidMoveOverElement(result);
 }
 
 void Chrome::setToolTip(const HitTestResult& result)
 {
     // First priority is a potential toolTip representing a spelling or grammar error
     TextDirection toolTipDirection;
     String toolTip = result.spellingToolTip(toolTipDirection);
 
     // Next we'll consider a tooltip for element with "title" attribute
     if (toolTip.isEmpty())
@@ skipping 105 matching lines @@
     for (size_t i = 0; i < observers.size(); ++i)
         observers[i]->willOpenPopup();
 }
 
 void Chrome::willBeDestroyed()
 {
     m_client->chromeDestroyed();
 }
 
 } // namespace blink