Remove an ExecutionContextTask subclass in DatabaseTracker

third_party/WebKit/Source/modules/webdatabase/DatabaseTracker.h

 /*
  * Copyright (C) 2007, 2008, 2013 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
@@ skipping 60 matching lines @@
     using DatabaseCallback = Function<void(Database*)>;
     void forEachOpenDatabaseInPage(Page*, std::unique_ptr<DatabaseCallback>);
 
     void prepareToOpenDatabase(Database*);
     void failedToOpenDatabase(Database*);
 
 private:
     using DatabaseSet = HashSet<CrossThreadPersistent<Database>>;
     using DatabaseNameMap = HashMap<String, DatabaseSet*>;
     using DatabaseOriginMap = HashMap<String, DatabaseNameMap*>;
-    class CloseOneDatabaseImmediatelyTask;
 
     DatabaseTracker();
 
     void closeOneDatabaseImmediately(const String& originIdentifier, const String& name, Database*);
 
     Mutex m_openDatabaseMapGuard;
 
     mutable std::unique_ptr<DatabaseOriginMap> m_openDatabaseMap;
 };
 
 } // namespace blink
 
 #endif // DatabaseTracker_h