Add an ASSERT about cross-world wrapper leakage into ScriptValue

Source/core/inspector/InjectedScriptBase.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 32 matching lines @@
 
 typedef String ErrorString;
 
 
 class InjectedScriptBase {
 public:
     virtual ~InjectedScriptBase() { }
 
     const String& name() const { return m_name; }
     bool isEmpty() const { return m_injectedScriptObject.isEmpty(); }
-    ScriptState* scriptState() const { return m_injectedScriptObject.scriptState(); }
+    ScriptState* scriptState() const
+    {
+        ASSERT(!isEmpty());
+        return m_injectedScriptObject.scriptState();
+    }
 
 protected:
     typedef bool (*InspectedStateAccessCheck)(ScriptState*);
     InjectedScriptBase(const String& name);
     InjectedScriptBase(const String& name, ScriptValue, InspectedStateAccessCheck);
 
     void initialize(ScriptValue, InspectedStateAccessCheck);
     bool canAccessInspectedWindow() const;
     const ScriptValue& injectedScriptObject() const;
     ScriptValue callFunctionWithEvalEnabled(ScriptFunctionCall&, bool& hadException) const;
     void makeCall(ScriptFunctionCall&, RefPtr<JSONValue>* result);
     void makeEvalCall(ErrorString*, ScriptFunctionCall&, RefPtr<TypeBuilder::Runtime::RemoteObject>* result, TypeBuilder::OptOutput<bool>* wasThrown);
 
 private:
     String m_name;
     ScriptValue m_injectedScriptObject;
     InspectedStateAccessCheck m_inspectedStateAccessCheck;
 };
 
 
 } // namespace WebCore
 
 #endif