Web SQL: Remove unnecessary abstraction.

Source/modules/webdatabase/DatabaseBackend.cpp

 /*
  * 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 11 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "modules/webdatabase/DatabaseBackend.h"
 
 #include "platform/Logging.h"
 #include "modules/webdatabase/ChangeVersionData.h"
 #include "modules/webdatabase/ChangeVersionWrapper.h"
+#include "modules/webdatabase/Database.h"
 #include "modules/webdatabase/DatabaseContext.h"
 #include "modules/webdatabase/DatabaseTask.h"
 #include "modules/webdatabase/DatabaseThread.h"
 #include "modules/webdatabase/DatabaseTracker.h"
 #include "modules/webdatabase/SQLTransaction.h"
 #include "modules/webdatabase/SQLTransactionBackend.h"
 #include "modules/webdatabase/SQLTransactionClient.h"
 #include "modules/webdatabase/SQLTransactionCoordinator.h"
 
 namespace blink {
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 {
     return databaseContext()->databaseThread()->transactionClient();
 }
 
 SQLTransactionCoordinator* DatabaseBackend::transactionCoordinator() const
 {
     return databaseContext()->databaseThread()->transactionCoordinator();
 }
 
 } // namespace blink