Tidy up WorkerConsoleAgent's handling of its WorkerGlobalScope reference.

Source/core/inspector/WorkerConsoleAgent.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 28 matching lines @@
 WorkerConsoleAgent::WorkerConsoleAgent(InspectorTimelineAgent* timelineAgent, InjectedScriptManager* injectedScriptManager, WorkerGlobalScope* workerGlobalScope)
     : InspectorConsoleAgent(timelineAgent, injectedScriptManager)
     , m_workerGlobalScope(workerGlobalScope)
 {
 }
 
 WorkerConsoleAgent::~WorkerConsoleAgent()
 {
 }
 
+void WorkerConsoleAgent::trace(Visitor* visitor)
+{
+    visitor->trace(m_workerGlobalScope);
+    InspectorConsoleAgent::trace(visitor);
+}
+
 ConsoleMessageStorage* WorkerConsoleAgent::messageStorage()
 {
     return m_workerGlobalScope->messageStorage();
 }
 
 void WorkerConsoleAgent::enableStackCapturingIfNeeded()
 {
     ScriptController::setCaptureCallStackForUncaughtExceptions(true);
 }
 
 void WorkerConsoleAgent::disableStackCapturingIfNeeded()
 {
     ScriptController::setCaptureCallStackForUncaughtExceptions(false);
 }
 
 void WorkerConsoleAgent::addInspectedNode(ErrorString* error, int)
 {
     *error = "addInspectedNode is not supported for workers";
 }
 
 } // namespace blink