Tried using CrossThreadPersistent for workerDebuggerAgents

Source/core/inspector/InspectorInspectorAgent.h

 /*
  * Copyright (C) 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 33 matching lines @@
 class InspectorFrontend;
 class InstrumentingAgents;
 class JSONObject;
 class Page;
 
 typedef String ErrorString;
 
 class InspectorInspectorAgent FINAL : public InspectorBaseAgent<InspectorInspectorAgent>, public InspectorBackendDispatcher::InspectorCommandHandler {
     WTF_MAKE_NONCOPYABLE(InspectorInspectorAgent);
 public:
-    static PassOwnPtr<InspectorInspectorAgent> create(Page* page, InjectedScriptManager* injectedScriptManager)
+    static PassOwnPtrWillBeRawPtr<InspectorInspectorAgent> create(Page* page, InjectedScriptManager* injectedScriptManager)
     {
-        return adoptPtr(new InspectorInspectorAgent(page, injectedScriptManager));
+        return adoptPtrWillBeNoop(new InspectorInspectorAgent(page, injectedScriptManager));
     }
 
     virtual ~InspectorInspectorAgent();
+    virtual void trace(Visitor*) OVERRIDE;
 
     // Inspector front-end API.
     virtual void enable(ErrorString*) OVERRIDE;
     virtual void disable(ErrorString*) OVERRIDE;
     virtual void reset(ErrorString*) OVERRIDE;
 
     virtual void init() OVERRIDE;
     virtual void setFrontend(InspectorFrontend*) OVERRIDE;
     virtual void clearFrontend() OVERRIDE;
 
     void didClearDocumentOfWindowObject(LocalFrame*);
 
     void domContentLoadedEventFired(LocalFrame*);
 
     bool hasFrontend() const { return m_frontend; }
 
     // Generic code called from custom implementations.
     void evaluateForTestInFrontend(long testCallId, const String& script);
 
     void setInjectedScriptForOrigin(const String& origin, const String& source);
 
     void inspect(PassRefPtr<TypeBuilder::Runtime::RemoteObject> objectToInspect, PassRefPtr<JSONObject> hints);
 
 private:
     InspectorInspectorAgent(Page*, InjectedScriptManager*);
 
-    Page* m_inspectedPage;
+    RawPtrWillBeMember<Page> m_inspectedPage;
     InspectorFrontend* m_frontend;
     InjectedScriptManager* m_injectedScriptManager;
 
     Vector<pair<long, String> > m_pendingEvaluateTestCommands;
     pair<RefPtr<TypeBuilder::Runtime::RemoteObject>, RefPtr<JSONObject> > m_pendingInspectData;
     typedef HashMap<String, String> InjectedScriptForOriginMap;
     InjectedScriptForOriginMap m_injectedScriptForOrigin;
 };
 
 } // namespace WebCore
 
 #endif // !defined(InspectorInspectorAgent_h)