Enable per thread heap for database thread

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 148 matching lines @@
     String m_filename;
 
     DatabaseGuid m_guid;
     int m_opened;
     bool m_new;
 
     SQLiteDatabase m_sqliteDatabase;
 
     Member<DatabaseAuthorizer> m_databaseAuthorizer;
 
-    HeapDeque<Member<SQLTransactionBackend>> m_transactionQueue;
+    Deque<CrossThreadPersistent<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