Tried using CrossThreadPersistent for workerDebuggerAgents

Source/core/inspector/InspectorWorkerAgent.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 InspectorFrontend;
 class InstrumentingAgents;
 class JSONObject;
 class KURL;
 class WorkerGlobalScopeProxy;
 
 typedef String ErrorString;
 
 class InspectorWorkerAgent FINAL : public InspectorBaseAgent<InspectorWorkerAgent>, public InspectorBackendDispatcher::WorkerCommandHandler {
 public:
-    static PassOwnPtr<InspectorWorkerAgent> create();
+    static PassOwnPtrWillBeRawPtr<InspectorWorkerAgent> create();
     virtual ~InspectorWorkerAgent();
 
     virtual void init() OVERRIDE;
     virtual void setFrontend(InspectorFrontend*) OVERRIDE;
     virtual void restore() OVERRIDE;
     virtual void clearFrontend() OVERRIDE;
 
     // Called from InspectorInstrumentation
     bool shouldPauseDedicatedWorkerOnStart();
     void didStartWorkerGlobalScope(WorkerGlobalScopeProxy*, const KURL&);
@@ skipping 19 matching lines @@
     class WorkerFrontendChannel;
     typedef HashMap<int, WorkerFrontendChannel*> WorkerChannels;
     WorkerChannels m_idToChannel;
     typedef HashMap<WorkerGlobalScopeProxy*, String> DedicatedWorkers;
     DedicatedWorkers m_dedicatedWorkers;
 };
 
 } // namespace WebCore
 
 #endif // !defined(InspectorWorkerAgent_h)