Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/modules/webdatabase/SQLStatementBackend.cpp

 /*
  * 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 207 matching lines @@
 void SQLStatementBackend::setFailureDueToQuota(DatabaseBackend* database)
 {
     ASSERT(!m_error && !m_resultSet);
     database->reportExecuteStatementResult(8, SQLError::QUOTA_ERR, 0);
     m_error = SQLError::create(SQLError::QUOTA_ERR, "there was not enough remaining storage space, or the storage quota was reached and the user declined to allow more space");
 }
 
 void SQLStatementBackend::clearFailureDueToQuota()
 {
     if (lastExecutionFailedDueToQuota())
-        m_error = 0;
+        m_error = nullptr;
 }
 
 bool SQLStatementBackend::lastExecutionFailedDueToQuota() const
 {
     return m_error && m_error->code() == SQLError::QUOTA_ERR;
 }
 
 } // namespace WebCore