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

Source/core/inspector/InspectorBaseAgent.cpp

 /*
  * 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 66 matching lines @@
     for (size_t i = 0; i < m_agents.size(); i++)
         m_agents[i]->restore();
 }
 
 void InspectorAgentRegistry::registerInDispatcher(InspectorBackendDispatcher* dispatcher)
 {
     for (size_t i = 0; i < m_agents.size(); i++)
         m_agents[i]->registerInDispatcher(dispatcher);
 }
 
-void InspectorAgentRegistry::discardAgents()
-{
-    for (size_t i = 0; i < m_agents.size(); i++)
-        m_agents[i]->discardAgent();
-}
-
 } // namespace WebCore