[DevTools] Improve performance of InstrumentingAgents.

third_party/WebKit/Source/core/inspector/PageConsoleAgent.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 50 matching lines @@
     visitor->trace(m_inspectorDOMAgent);
     visitor->trace(m_inspectedFrames);
     visitor->trace(m_workersWithEnabledConsole);
     InspectorConsoleAgent::trace(visitor);
 }
 
 void PageConsoleAgent::enable(ErrorString* errorString)
 {
     InspectorConsoleAgent::enable(errorString);
     m_workersWithEnabledConsole.clear();
-    m_instrumentingAgents->setPageConsoleAgent(this);
+    m_instrumentingAgents->addPageConsoleAgent(this);
 }
 
 void PageConsoleAgent::disable(ErrorString* errorString)
 {
-    m_instrumentingAgents->setPageConsoleAgent(nullptr);
+    m_instrumentingAgents->removePageConsoleAgent(this);
     InspectorConsoleAgent::disable(errorString);
     m_workersWithEnabledConsole.clear();
 }
 
 void PageConsoleAgent::clearMessages(ErrorString* errorString)
 {
     messageStorage()->clear(m_inspectedFrames->root()->document());
 }
 
 void PageConsoleAgent::workerConsoleAgentEnabled(WorkerInspectorProxy* workerInspectorProxy)
@@ skipping 38 matching lines @@
     ++s_enabledAgentCount;
 }
 
 void PageConsoleAgent::disableStackCapturingIfNeeded()
 {
     if (!(--s_enabledAgentCount))
         ScriptController::setCaptureCallStackForUncaughtExceptions(toIsolate(m_inspectedFrames->root()), false);
 }
 
 } // namespace blink