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

Source/core/inspector/InspectorDOMDebuggerAgent.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 72 matching lines @@
     : InspectorBaseAgent<InspectorDOMDebuggerAgent>("DOMDebugger", instrumentingAgents, inspectorState)
     , m_domAgent(domAgent)
     , m_debuggerAgent(debuggerAgent)
     , m_pauseInNextEventListener(false)
 {
     m_debuggerAgent->setListener(this);
 }
 
 InspectorDOMDebuggerAgent::~InspectorDOMDebuggerAgent()
 {
-    ASSERT(!m_debuggerAgent);
+    if (m_debuggerAgent)
+        m_debuggerAgent->setListener(0);
     ASSERT(!m_instrumentingAgents->inspectorDOMDebuggerAgent());
 }
 
 // Browser debugger agent enabled only when JS debugger is enabled.
 void InspectorDOMDebuggerAgent::debuggerWasEnabled()
 {
     m_instrumentingAgents->setInspectorDOMDebuggerAgent(this);
 }
 
 void InspectorDOMDebuggerAgent::debuggerWasDisabled()
 {
     disable();
 }
 
 void InspectorDOMDebuggerAgent::stepInto()
 {
     m_pauseInNextEventListener = true;
 }
 
 void InspectorDOMDebuggerAgent::didPause()
 {
     m_pauseInNextEventListener = false;
 }
 
+void InspectorDOMDebuggerAgent::willDestroyDebuggerAgent()
+{
+    m_debuggerAgent = 0;
+}
+
 void InspectorDOMDebuggerAgent::didProcessTask()
 {
     if (!m_pauseInNextEventListener)
         return;
     if (m_debuggerAgent && m_debuggerAgent->runningNestedMessageLoop())
         return;
     m_pauseInNextEventListener = false;
 }
 
 void InspectorDOMDebuggerAgent::disable()
 {
     m_instrumentingAgents->setInspectorDOMDebuggerAgent(0);
     clear();
 }
 
 void InspectorDOMDebuggerAgent::clearFrontend()
 {
     disable();
 }
 
-void InspectorDOMDebuggerAgent::discardAgent()
-{
-    m_debuggerAgent->setListener(0);
-    m_debuggerAgent = 0;
-}
-
 void InspectorDOMDebuggerAgent::discardBindings()
 {
     m_domBreakpoints.clear();
 }
 
 void InspectorDOMDebuggerAgent::setEventListenerBreakpoint(ErrorString* error, const String& eventName)
 {
     setBreakpoint(error, String(listenerEventCategoryType) + eventName);
 }
 
@@ skipping 370 matching lines @@
 }
 
 void InspectorDOMDebuggerAgent::clear()
 {
     m_domBreakpoints.clear();
     m_pauseInNextEventListener = false;
 }
 
 } // namespace WebCore