Inspector: replace generic discardAgents logic with explicit call to discard a listener.

Source/core/inspector/InspectorBaseAgent.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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 34 matching lines @@
 
 class InspectorBaseAgentInterface {
 public:
     InspectorBaseAgentInterface(const String&, InstrumentingAgents*, InspectorCompositeState*);
     virtual ~InspectorBaseAgentInterface();
 
     virtual void setFrontend(InspectorFrontend*) { }
     virtual void clearFrontend() { }
     virtual void restore() { }
     virtual void registerInDispatcher(InspectorBackendDispatcher*) = 0;
-    virtual void discardAgent() { }
 
     String name() { return m_name; }
 
     virtual void reportMemoryUsage(MemoryObjectInfo*) const;
 
 protected:
     InstrumentingAgents* m_instrumentingAgents;
     InspectorState* m_state;
 
 private:
     String m_name;
 };
 
 class InspectorAgentRegistry {
 public:
     void append(PassOwnPtr<InspectorBaseAgentInterface>);
 
     void setFrontend(InspectorFrontend*);
     void clearFrontend();
     void restore();
     void registerInDispatcher(InspectorBackendDispatcher*);
-    void discardAgents();
 
 private:
     Vector<OwnPtr<InspectorBaseAgentInterface> > m_agents;
 };
 
 template<typename T>
 class InspectorBaseAgent : public InspectorBaseAgentInterface {
 public:
     virtual ~InspectorBaseAgent() { }
 
     virtual void registerInDispatcher(InspectorBackendDispatcher* dispatcher)
     {
         dispatcher->registerAgent(static_cast<T*>(this));
     }
 
 protected:
     InspectorBaseAgent(const String& name, InstrumentingAgents* instrumentingAgents, InspectorCompositeState* inspectorState)
         : InspectorBaseAgentInterface(name, instrumentingAgents, inspectorState)
     {
     }
 };
 
 } // namespace WebCore
 
 #endif // !defined(InspectorBaseAgent_h)