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

Source/modules/webdatabase/SQLTransactionBackend.h

 /*
  * Copyright (C) 2007, 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 42 matching lines @@
     virtual bool performPreflight(SQLTransactionBackend*) = 0;
     virtual bool performPostflight(SQLTransactionBackend*) = 0;
     virtual SQLErrorData* sqlError() const = 0;
     virtual void handleCommitFailedAfterPostflight(SQLTransactionBackend*) = 0;
 };
 
 class SQLTransactionBackend final : public GarbageCollectedFinalized<SQLTransactionBackend>, public SQLTransactionStateMachine<SQLTransactionBackend> {
 public:
     static SQLTransactionBackend* create(Database*, SQLTransaction*, SQLTransactionWrapper*, bool readOnly);
 
-    virtual ~SQLTransactionBackend();
+    ~SQLTransactionBackend() override;
     DECLARE_TRACE();
 
     void lockAcquired();
     void performNextStep();
 
     Database* database() { return m_database.get(); }
     bool isReadOnly() { return m_readOnly; }
     void notifyDatabaseThreadIsShuttingDown();
 
     // APIs called from the frontend published:
     void requestTransitToState(SQLTransactionState);
     SQLErrorData* transactionError();
     SQLStatement* currentStatement();
     void setShouldRetryCurrentStatement(bool);
     void executeSQL(SQLStatement*, const String& statement, const Vector<SQLValue>& arguments, int permissions);
 
 private:
     SQLTransactionBackend(Database*, SQLTransaction*, SQLTransactionWrapper*, bool readOnly);
 
     void doCleanup();
 
     void enqueueStatementBackend(SQLStatementBackend*);
 
     // State Machine functions:
-    virtual StateFunction stateFunctionFor(SQLTransactionState) override;
+    StateFunction stateFunctionFor(SQLTransactionState) override;
     void computeNextStateAndCleanupIfNeeded();
 
     // State functions:
     SQLTransactionState acquireLock();
     SQLTransactionState openTransactionAndPreflight();
     SQLTransactionState runStatements();
     SQLTransactionState postflightAndCommit();
     SQLTransactionState cleanupAndTerminate();
     SQLTransactionState cleanupAfterTransactionErrorCallback();
 
@@ skipping 24 matching lines @@
 
     Mutex m_statementMutex;
     HeapDeque<Member<SQLStatementBackend>> m_statementQueue;
 
     OwnPtr<SQLiteTransaction> m_sqliteTransaction;
 };
 
 } // namespace blink
 
 #endif // SQLTransactionBackend_h