Update more core classes to use OVERRIDE / FINAL when needed

Source/core/inspector/InspectorAgent.h

 /*
  * Copyright (C) 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Google 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.
@@ skipping 41 matching lines @@
     WTF_MAKE_NONCOPYABLE(InspectorAgent);
 public:
     static PassOwnPtr<InspectorAgent> create(Page* page, InjectedScriptManager* injectedScriptManager, InstrumentingAgents* instrumentingAgents, InspectorCompositeState* state)
     {
         return adoptPtr(new InspectorAgent(page, injectedScriptManager, instrumentingAgents, state));
     }
 
     virtual ~InspectorAgent();
 
     // Inspector front-end API.
-    void enable(ErrorString*);
-    void disable(ErrorString*);
-    void reset(ErrorString*);
+    virtual void enable(ErrorString*) OVERRIDE;
+    virtual void disable(ErrorString*) OVERRIDE;
+    virtual void reset(ErrorString*) OVERRIDE;
 
     virtual void setFrontend(InspectorFrontend*) OVERRIDE;
     virtual void clearFrontend() OVERRIDE;
 
     void didClearWindowObjectInWorld(Frame*, DOMWrapperWorld*);
 
     void didCommitLoad(Frame*, DocumentLoader*);
     void domContentLoadedEventFired(Frame*);
 
     bool hasFrontend() const { return m_frontend; }
@@ skipping 14 matching lines @@
 
     Vector<pair<long, String> > m_pendingEvaluateTestCommands;
     pair<RefPtr<TypeBuilder::Runtime::RemoteObject>, RefPtr<JSONObject> > m_pendingInspectData;
     typedef HashMap<String, String> InjectedScriptForOriginMap;
     InjectedScriptForOriginMap m_injectedScriptForOrigin;
 };
 
 } // namespace WebCore
 
 #endif // !defined(InspectorAgent_h)