Tried using CrossThreadPersistent for workerDebuggerAgents

Source/core/inspector/InspectorResourceAgent.h

Index: Source/core/inspector/InspectorResourceAgent.h
diff --git a/Source/core/inspector/InspectorResourceAgent.h b/Source/core/inspector/InspectorResourceAgent.h
index cbd98b899a922bf37040d8b440e278a139557a9c..31d02f1ee74c88b8d0d4784b0971db820687dcea 100644
--- a/Source/core/inspector/InspectorResourceAgent.h
+++ b/Source/core/inspector/InspectorResourceAgent.h
@@ -73,9 +73,9 @@ typedef String ErrorString;
 
 class InspectorResourceAgent FINAL : public InspectorBaseAgent<InspectorResourceAgent>, public InspectorBackendDispatcher::NetworkCommandHandler {
 public:
-    static PassOwnPtr<InspectorResourceAgent> create(InspectorPageAgent* pageAgent)
+    static PassOwnPtrWillBeRawPtr<InspectorResourceAgent> create(InspectorPageAgent* pageAgent)
     {
-        return adoptPtr(new InspectorResourceAgent(pageAgent));
+        return adoptPtrWillBeNoop(new InspectorResourceAgent(pageAgent));
     }
 
     virtual void setFrontend(InspectorFrontend*) OVERRIDE;
@@ -83,6 +83,7 @@ public:
     virtual void restore() OVERRIDE;
 
     virtual ~InspectorResourceAgent();
+    virtual void trace(Visitor*) OVERRIDE;
 
     // Called from instrumentation.
     void willSendRequest(unsigned long identifier, DocumentLoader*, ResourceRequest&, const ResourceResponse& redirectResponse, const FetchInitiatorInfo&);
@@ -149,7 +150,7 @@ private:
 
     void enable();
 
-    InspectorPageAgent* m_pageAgent;
+    RawPtrWillBeMember<InspectorPageAgent> m_pageAgent;
     InspectorFrontend::Network* m_frontend;
     String m_userAgentOverride;
     OwnPtr<NetworkResourcesData> m_resourcesData;