Tidy up WorkerConsoleAgent's handling of its WorkerGlobalScope reference.

Source/core/inspector/WorkerConsoleAgent.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 28 matching lines @@
 class WorkerGlobalScope;
 
 class WorkerConsoleAgent final : public InspectorConsoleAgent {
     WTF_MAKE_NONCOPYABLE(WorkerConsoleAgent);
 public:
     static PassOwnPtrWillBeRawPtr<WorkerConsoleAgent> create(InspectorTimelineAgent* timelineAgent, InjectedScriptManager* injectedScriptManager, WorkerGlobalScope* workerGlobalScope)
     {
         return adoptPtrWillBeNoop(new WorkerConsoleAgent(timelineAgent, injectedScriptManager, workerGlobalScope));
     }
     virtual ~WorkerConsoleAgent();
+    virtual void trace(Visitor*) override;
 
     virtual bool isWorkerAgent() override { return true; }
 
 protected:
     virtual ConsoleMessageStorage* messageStorage() override;
 
     virtual void enableStackCapturingIfNeeded() override;
     virtual void disableStackCapturingIfNeeded() override;
 
 private:
     WorkerConsoleAgent(InspectorTimelineAgent*, InjectedScriptManager*, WorkerGlobalScope*);
     virtual void addInspectedNode(ErrorString*, int nodeId) override;
 
-    WorkerGlobalScope* m_workerGlobalScope;
+    RawPtrWillBeMember<WorkerGlobalScope> m_workerGlobalScope;
 };
 
 } // namespace blink
 
 #endif // !defined(WorkerConsoleAgent_h)