Use a HashCountedSet to count identifiers in InspectorConsoleAgent

Source/core/inspector/InspectorConsoleAgent.h

 /*
  * 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.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 14 matching lines @@
 #ifndef InspectorConsoleAgent_h
 #define InspectorConsoleAgent_h
 
 #include "InspectorFrontend.h"
 #include "bindings/v8/ScriptState.h"
 #include "bindings/v8/ScriptString.h"
 #include "core/inspector/ConsoleAPITypes.h"
 #include "core/inspector/InspectorBaseAgent.h"
 #include "core/frame/ConsoleTypes.h"
 #include "wtf/Forward.h"
+#include "wtf/HashCountedSet.h"
 #include "wtf/HashMap.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/Vector.h"
 #include "wtf/text/StringHash.h"
 
 namespace WebCore {
 
 class ConsoleMessage;
 class DocumentLoader;
 class DOMWindow;
@@ skipping 59 matching lines @@
 
 protected:
     void addConsoleMessage(PassOwnPtr<ConsoleMessage>);
 
     InspectorTimelineAgent* m_timelineAgent;
     InjectedScriptManager* m_injectedScriptManager;
     InspectorFrontend::Console* m_frontend;
     ConsoleMessage* m_previousMessage;
     Vector<OwnPtr<ConsoleMessage> > m_consoleMessages;
     int m_expiredConsoleMessageCount;
-    HashMap<String, unsigned> m_counts;
+    HashCountedSet<String> m_counts;
     HashMap<String, double> m_times;
     bool m_enabled;
 private:
     static int s_enabledAgentCount;
 };
 
 } // namespace WebCore
 
 
 #endif // !defined(InspectorConsoleAgent_h)