Manage WebSQL callbacks with OwnPtr instead of refcounting

Source/modules/webdatabase/SQLTransactionBackendSync.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 33 matching lines @@
 #include "modules/webdatabase/SQLResultSet.h"
 #include "modules/webdatabase/SQLStatementSync.h"
 #include "modules/webdatabase/SQLTransactionClient.h"
 #include "modules/webdatabase/SQLTransactionSync.h"
 #include "modules/webdatabase/SQLTransactionSyncCallback.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefPtr.h"
 
 namespace WebCore {
 
-SQLTransactionBackendSync::SQLTransactionBackendSync(DatabaseSync* db, PassRefPtr<SQLTransactionSyncCallback> callback, bool readOnly)
+SQLTransactionBackendSync::SQLTransactionBackendSync(DatabaseSync* db, PassOwnPtr<SQLTransactionSyncCallback> callback, bool readOnly)
     : m_database(db)
     , m_callback(callback)
     , m_readOnly(readOnly)
     , m_hasVersionMismatch(false)
     , m_modifiedDatabase(false)
     , m_transactionClient(adoptPtr(new SQLTransactionClient()))
 {
     ASSERT(m_database->executionContext()->isContextThread());
 }
 
@@ skipping 171 matching lines @@
     if (m_sqliteTransaction) {
         m_sqliteTransaction->rollback();
         m_sqliteTransaction.clear();
     }
     m_database->enableAuthorizer();
 
     ASSERT(!m_database->sqliteDatabase().transactionInProgress());
 }
 
 } // namespace WebCore