Tried using CrossThreadPersistent for workerDebuggerAgents

Source/core/inspector/InspectorDOMAgent.h

Index: Source/core/inspector/InspectorDOMAgent.h
diff --git a/Source/core/inspector/InspectorDOMAgent.h b/Source/core/inspector/InspectorDOMAgent.h
index f5174aeaac9be542fad47a5bef046c6bd9387485..5e7ed8588bab63375cf9bc462ae3487a4845272b 100644
--- a/Source/core/inspector/InspectorDOMAgent.h
+++ b/Source/core/inspector/InspectorDOMAgent.h
@@ -95,14 +95,15 @@ public:
         virtual void didModifyDOMAttr(Element*) = 0;
     };
 
-    static PassOwnPtr<InspectorDOMAgent> create(InspectorPageAgent* pageAgent, InjectedScriptManager* injectedScriptManager, InspectorOverlay* overlay)
+    static PassOwnPtrWillBeRawPtr<InspectorDOMAgent> create(InspectorPageAgent* pageAgent, InjectedScriptManager* injectedScriptManager, InspectorOverlay* overlay)
     {
-        return adoptPtr(new InspectorDOMAgent(pageAgent, injectedScriptManager, overlay));
+        return adoptPtrWillBeNoop(new InspectorDOMAgent(pageAgent, injectedScriptManager, overlay));
     }
 
     static String toErrorString(ExceptionState&);
 
     virtual ~InspectorDOMAgent();
+    virtual void trace(Visitor*);
 
     virtual void setFrontend(InspectorFrontend*) OVERRIDE;
     virtual void clearFrontend() OVERRIDE;
@@ -253,7 +254,7 @@ private:
 
     bool pushDocumentUponHandlelessOperation(ErrorString*);
 
-    InspectorPageAgent* m_pageAgent;
+    RawPtrWillBeMember<InspectorPageAgent> m_pageAgent;
     InjectedScriptManager* m_injectedScriptManager;
     InspectorOverlay* m_overlay;
     InspectorFrontend::DOM* m_frontend;
@@ -269,11 +270,11 @@ private:
     RefPtr<Document> m_document;
     typedef HashMap<String, Vector<RefPtr<Node> > > SearchResults;
     SearchResults m_searchResults;
-    OwnPtr<RevalidateStyleAttributeTask> m_revalidateStyleAttrTask;
+    OwnPtrWillBeMember<RevalidateStyleAttributeTask> m_revalidateStyleAttrTask;
     SearchMode m_searchingForNode;
     OwnPtr<HighlightConfig> m_inspectModeHighlightConfig;
-    OwnPtr<InspectorHistory> m_history;
-    OwnPtr<DOMEditor> m_domEditor;
+    OwnPtrWillBeMember<InspectorHistory> m_history;
+    OwnPtrWillBeMember<DOMEditor> m_domEditor;
     bool m_suppressAttributeModifiedEvent;
     Listener* m_listener;
 };