Tried using CrossThreadPersistent for workerDebuggerAgents

Source/core/inspector/InspectorInputAgent.h

 /*
  * Copyright (C) 2012 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 27 matching lines @@
 
 namespace WebCore {
 class InspectorClient;
 class Page;
 
 typedef String ErrorString;
 
 class InspectorInputAgent FINAL : public InspectorBaseAgent<InspectorInputAgent>, public InspectorBackendDispatcher::InputCommandHandler {
     WTF_MAKE_NONCOPYABLE(InspectorInputAgent);
 public:
-    static PassOwnPtr<InspectorInputAgent> create(Page* page, InspectorClient* client)
+    static PassOwnPtrWillBeRawPtr<InspectorInputAgent> create(Page* page, InspectorClient* client)
     {
-        return adoptPtr(new InspectorInputAgent(page, client));
+        return adoptPtrWillBeNoop(new InspectorInputAgent(page, client));
     }
 
     virtual ~InspectorInputAgent();
+    virtual void trace(Visitor*) OVERRIDE;
 
     // Methods called from the frontend for simulating input.
     virtual void dispatchKeyEvent(ErrorString*, const String& type, const int* modifiers, const double* timestamp, const String* text, const String* unmodifiedText, const String* keyIdentifier, const int* windowsVirtualKeyCode, const int* nativeVirtualKeyCode, const bool* autoRepeat, const bool* isKeypad, const bool* isSystemKey) OVERRIDE;
     virtual void dispatchMouseEvent(ErrorString*, const String& type, int x, int y, const int* modifiers, const double* timestamp, const String* button, const int* clickCount, const bool* deviceSpace) OVERRIDE;
     virtual void dispatchTouchEvent(ErrorString*, const String& type, const RefPtr<JSONArray>& touchPoints, const int* modifiers, const double* timestamp) OVERRIDE;
 private:
     InspectorInputAgent(Page*, InspectorClient*);
 
-    Page* m_page;
+    RawPtrWillBeMember<Page> m_page;
     InspectorClient* m_client;
 };
 
 
 } // namespace WebCore
 
 #endif // !defined(InspectorInputAgent_h)