Removed unregisterTerminationObserver from DatabaseContext::contextDestroyed

Source/core/workers/WorkerGlobalScope.h

 /*
  * Copyright (C) 2008, 2009 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 76 matching lines @@
     void clearInspector();
 
     // FIXME: We can remove this interface when we remove openDatabaseSync.
     class TerminationObserver {
     public:
         virtual ~TerminationObserver() { }
         // The function is probably called in the main thread.
         virtual void wasRequestedToTerminate() = 0;
     };
     void registerTerminationObserver(TerminationObserver*);
-    void unregisterTerminationObserver(TerminationObserver*);
     void wasRequestedToTerminate();
 
     void dispose();
 
     WorkerThread* thread() const { return m_thread; }
 
     virtual void postTask(PassOwnPtr<ExecutionContextTask>) OVERRIDE FINAL; // Executes the task on context's thread asynchronously.
 
     // WorkerGlobalScope
     WorkerGlobalScope* self() { return this; }
@@ skipping 78 matching lines @@
     TerminationObserver* m_terminationObserver;
 
     OwnPtrWillBeMember<ConsoleMessageStorage> m_messageStorage;
 };
 
 DEFINE_TYPE_CASTS(WorkerGlobalScope, ExecutionContext, context, context->isWorkerGlobalScope(), context.isWorkerGlobalScope());
 
 } // namespace blink
 
 #endif // WorkerGlobalScope_h