Remove PlatformMouseEvent::m_modifierFlags member.

Source/core/page/EventHandler.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
  *
  * 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.
@@ skipping 1359 matching lines @@
 
     if (RenderLayer* layer = layerForNode(hoveredNode.innerNode())) {
         if (ScrollableArea* layerScrollableArea = associatedScrollableArea(layer))
             layerScrollableArea->mouseMovedInContentArea();
     }
 
     if (FrameView* frameView = m_frame->view())
         frameView->mouseMovedInContentArea();
 
     hoveredNode.setToShadowHostIfInUserAgentShadowRoot();
-    page->chrome().mouseDidMoveOverElement(hoveredNode, event.modifierFlags());
+    page->chrome().mouseDidMoveOverElement(hoveredNode);
     page->chrome().setToolTip(hoveredNode);
 
     return result;
 }
 
 void EventHandler::handleMouseLeaveEvent(const PlatformMouseEvent& event)
 {
     TRACE_EVENT0("blink", "EventHandler::handleMouseLeaveEvent");
 
     RefPtrWillBeRawPtr<FrameView> protector(m_frame->view());
@@ skipping 2472 matching lines @@
 unsigned EventHandler::accessKeyModifiers()
 {
 #if OS(MACOSX)
     return PlatformEvent::CtrlKey | PlatformEvent::AltKey;
 #else
     return PlatformEvent::AltKey;
 #endif
 }
 
 } // namespace blink