Fix virtual/override/final usage in Source/modules/.

Source/modules/webdatabase/DatabaseTracker.cpp

 /*
  * Copyright (C) 2011 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 95 matching lines @@
     databaseSet->add(database);
 }
 
 class NotifyDatabaseObserverOnCloseTask final : public ExecutionContextTask {
 public:
     static PassOwnPtr<NotifyDatabaseObserverOnCloseTask> create(Database* database)
     {
         return adoptPtr(new NotifyDatabaseObserverOnCloseTask(database));
     }
 
-    virtual void performTask(ExecutionContext*) override
+    void performTask(ExecutionContext*) override
     {
         databaseClosed(m_database.get());
     }
 
 private:
     explicit NotifyDatabaseObserverOnCloseTask(Database* database)
         : m_database(database)
     {
     }
 
@@ skipping 66 matching lines @@
     return databaseSize + spaceAvailable;
 }
 
 class DatabaseTracker::CloseOneDatabaseImmediatelyTask final : public ExecutionContextTask {
 public:
     static PassOwnPtr<CloseOneDatabaseImmediatelyTask> create(const String& originIdentifier, const String& name, Database* database)
     {
         return adoptPtr(new CloseOneDatabaseImmediatelyTask(originIdentifier, name, database));
     }
 
-    virtual void performTask(ExecutionContext*) override
+    void performTask(ExecutionContext*) override
     {
         DatabaseTracker::tracker().closeOneDatabaseImmediately(m_originIdentifier, m_name, m_database);
     }
 
 private:
     CloseOneDatabaseImmediatelyTask(const String& originIdentifier, const String& name, Database* database)
         : m_originIdentifier(originIdentifier.isolatedCopy())
         , m_name(name.isolatedCopy())
         , m_database(database)
     {
@@ skipping 42 matching lines @@
         DatabaseSet::iterator found = databaseSet->find(database);
         if (found == databaseSet->end())
             return;
     }
 
     // And we have to call closeImmediately() without our collection lock being held.
     database->closeImmediately();
 }
 
 } // namespace blink