Have WorkerScriptController::workerGlobalScope return a reference

Source/bindings/v8/WorkerScriptController.h

 /*
  * Copyright (C) 2009, 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 45 matching lines @@
         bool hadException;
         String errorMessage;
         int lineNumber;
         int columnNumber;
         String sourceURL;
         ScriptValue exception;
     };
 
     class WorkerScriptController {
     public:
-        WorkerScriptController(WorkerGlobalScope*);
+        explicit WorkerScriptController(WorkerGlobalScope&);
         ~WorkerScriptController();
 
-        WorkerGlobalScope* workerGlobalScope() { return m_workerGlobalScope; }
+        WorkerGlobalScope& workerGlobalScope() { return m_workerGlobalScope; }
 
         void evaluate(const ScriptSourceCode&, RefPtr<ErrorEvent>* = 0);
 
         void rethrowExceptionFromImportedScript(PassRefPtr<ErrorEvent>);
 
         // Async request to terminate a future JS execution. Eventually causes termination
         // exception raised during JS execution, if the worker thread happens to run JS.
         // After JS execution was terminated in this way, the Worker thread has to use
         // forbidExecution()/isExecutionForbidden() to guard against reentry into JS.
         // Can be called from any thread.
@@ skipping 20 matching lines @@
         // Returns true if the embedder should stop calling idleNotification
         // until real work has been done.
         bool idleNotification() { return v8::V8::IdleNotification(); }
 
         v8::Isolate* isolate() const { return m_isolate; }
 
     private:
         bool initializeContextIfNeeded();
         void disposeContext();
 
-        WorkerGlobalScope* m_workerGlobalScope;
+        WorkerGlobalScope& m_workerGlobalScope;
         v8::Isolate* m_isolate;
         ScopedPersistent<v8::Context> m_context;
         OwnPtr<V8PerContextData> m_perContextData;
         String m_disableEvalPending;
         OwnPtr<DOMDataStore> m_domDataStore;
         bool m_executionForbidden;
         bool m_executionScheduledToTerminate;
         mutable Mutex m_scheduledTerminationMutex;
         RefPtr<ErrorEvent> m_errorEventFromImportedScript;
     };
 
 } // namespace WebCore
 
 #endif // WorkerScriptController_h