Tried using CrossThreadPersistent for workerDebuggerAgents

Source/core/inspector/WorkerDebuggerAgent.h

Index: Source/core/inspector/WorkerDebuggerAgent.h
diff --git a/Source/core/inspector/WorkerDebuggerAgent.h b/Source/core/inspector/WorkerDebuggerAgent.h
index 2383bfd13b33c911c2fde01fba3b97cd0c4ab1ff..738f2777419000c1441d2e8424731e4ef6b02834 100644
--- a/Source/core/inspector/WorkerDebuggerAgent.h
+++ b/Source/core/inspector/WorkerDebuggerAgent.h
@@ -41,10 +41,11 @@ class WorkerThread;
 
 class WorkerDebuggerAgent FINAL : public InspectorDebuggerAgent {
     WTF_MAKE_NONCOPYABLE(WorkerDebuggerAgent);
-    WTF_MAKE_FAST_ALLOCATED;
+    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
 public:
-    static PassOwnPtr<WorkerDebuggerAgent> create(WorkerScriptDebugServer*, WorkerGlobalScope*, InjectedScriptManager*);
+    static PassOwnPtrWillBeRawPtr<WorkerDebuggerAgent> create(WorkerScriptDebugServer*, WorkerGlobalScope*, InjectedScriptManager*);
     virtual ~WorkerDebuggerAgent();
+    virtual void trace(Visitor*) OVERRIDE;
 
     static void interruptAndDispatchInspectorCommands(WorkerThread*);
 
@@ -59,7 +60,7 @@ private:
     virtual void unmuteConsole() OVERRIDE;
 
     WorkerScriptDebugServer* m_scriptDebugServer;
-    WorkerGlobalScope* m_inspectedWorkerGlobalScope;
+    RawPtrWillBeMember<WorkerGlobalScope> m_inspectedWorkerGlobalScope;
 };
 
 } // namespace WebCore