Avoid data race on Database::m_opened.

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

 /*
  * Copyright (C) 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 63 matching lines @@
         VoidCallback* successCallback);
     void transaction(
         SQLTransactionCallback*,
         SQLTransactionErrorCallback*,
         VoidCallback* successCallback);
     void readTransaction(
         SQLTransactionCallback*,
         SQLTransactionErrorCallback*,
         VoidCallback* successCallback);
 
-    bool opened() const { return m_opened; }
+    bool opened();
     bool isNew() const { return m_new; }
 
     SecurityOrigin* securityOrigin() const;
     String stringIdentifier() const;
     String displayName() const;
     unsigned long estimatedSize() const;
     String fileName() const;
     SQLiteDatabase& sqliteDatabase() { return m_sqliteDatabase; }
 
     unsigned long long maximumSize() const;
@@ skipping 59 matching lines @@
     RefPtr<SecurityOrigin> m_databaseThreadSecurityOrigin;
     Member<DatabaseContext> m_databaseContext; // Associated with m_executionContext.
 
     String m_name;
     String m_expectedVersion;
     String m_displayName;
     unsigned long m_estimatedSize;
     String m_filename;
 
     DatabaseGuid m_guid;
-    bool m_opened;
+    int m_opened;
     bool m_new;
 
     SQLiteDatabase m_sqliteDatabase;
 
     Member<DatabaseAuthorizer> m_databaseAuthorizer;
 
     HeapDeque<Member<SQLTransactionBackend>> m_transactionQueue;
     Mutex m_transactionInProgressMutex;
     bool m_transactionInProgress;
     bool m_isTransactionQueueEnabled;
 
     friend class ChangeVersionWrapper;
     friend class DatabaseManager;
     friend class SQLStatementBackend;
     friend class SQLTransaction;
     friend class SQLTransactionBackend;
 };
 
 } // namespace blink
 
 #endif // Database_h