Remove PlatformMouseEvent::m_modifierFlags member.

Source/core/loader/EmptyClients.h

 /*
  * Copyright (C) 2006 Eric Seidel (eric@webkit.org)
  * Copyright (C) 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * Copyright (C) 2012 Samsung Electronics. 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
@@ skipping 117 matching lines @@
     virtual IntRect windowResizerRect() const override { return IntRect(); }
 
     virtual void invalidateContentsAndRootView(const IntRect&) override { }
     virtual void invalidateContentsForSlowScroll(const IntRect&) override { }
     virtual void scheduleAnimation() override { }
 
     virtual IntRect rootViewToScreen(const IntRect& r) const override { return r; }
     virtual blink::WebScreenInfo screenInfo() const override { return blink::WebScreenInfo(); }
     virtual void contentsSizeChanged(LocalFrame*, const IntSize&) const override { }
 
-    virtual void mouseDidMoveOverElement(const HitTestResult&, unsigned) override { }
+    virtual void mouseDidMoveOverElement(const HitTestResult&) override { }
 
     virtual void setToolTip(const String&, TextDirection) override { }
 
     virtual void print(LocalFrame*) override { }
 
     virtual void enumerateChosenDirectory(FileChooser*) override { }
 
     virtual PassOwnPtrWillBeRawPtr<ColorChooser> createColorChooser(LocalFrame*, ColorChooserClient*, const Color&) override;
     virtual PassRefPtr<DateTimeChooser> openDateTimeChooser(DateTimeChooserClient*, const DateTimeChooserParameters&) override;
     virtual void openTextDataListChooser(HTMLInputElement&) override;
@@ skipping 181 matching lines @@
 public:
     virtual PassOwnPtr<StorageNamespace> createSessionStorageNamespace() override;
     virtual bool canAccessStorage(LocalFrame*, StorageType) const override { return false; }
 };
 
 void fillWithEmptyClients(Page::PageClients&);
 
 }
 
 #endif // EmptyClients_h