Tried using CrossThreadPersistent for workerDebuggerAgents

Source/core/inspector/PageRuntimeAgent.h

Index: Source/core/inspector/PageRuntimeAgent.h
diff --git a/Source/core/inspector/PageRuntimeAgent.h b/Source/core/inspector/PageRuntimeAgent.h
index 06d3a0fb473532322e70a36b4904f454bff43a8f..f0c5309375fad897abf020520a19f413754edbe8 100644
--- a/Source/core/inspector/PageRuntimeAgent.h
+++ b/Source/core/inspector/PageRuntimeAgent.h
@@ -43,11 +43,12 @@ class SecurityOrigin;
 
 class PageRuntimeAgent FINAL : public InspectorRuntimeAgent {
 public:
-    static PassOwnPtr<PageRuntimeAgent> create(InjectedScriptManager* injectedScriptManager, ScriptDebugServer* scriptDebugServer, Page* page, InspectorPageAgent* pageAgent)
+    static PassOwnPtrWillBeRawPtr<PageRuntimeAgent> create(InjectedScriptManager* injectedScriptManager, ScriptDebugServer* scriptDebugServer, Page* page, InspectorPageAgent* pageAgent)
     {
-        return adoptPtr(new PageRuntimeAgent(injectedScriptManager, scriptDebugServer, page, pageAgent));
+        return adoptPtrWillBeNoop(new PageRuntimeAgent(injectedScriptManager, scriptDebugServer, page, pageAgent));
     }
     virtual ~PageRuntimeAgent();
+    virtual void trace(Visitor*) OVERRIDE;
     virtual void init() OVERRIDE;
     virtual void enable(ErrorString*) OVERRIDE;
 
@@ -64,7 +65,7 @@ private:
     void reportExecutionContextCreation();
 
     Page* m_inspectedPage;
-    InspectorPageAgent* m_pageAgent;
+    RawPtrWillBeMember<InspectorPageAgent> m_pageAgent;
     bool m_mainWorldContextCreated;
 };