Port messages sent by WebIDBFactoryImpl to Mojo.

content/browser/indexed_db/mock_indexed_db_database_callbacks.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/indexed_db/mock_indexed_db_database_callbacks.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace content {
 
 MockIndexedDBDatabaseCallbacks::MockIndexedDBDatabaseCallbacks()
-    : IndexedDBDatabaseCallbacks(NULL, 0, 0),
+    : IndexedDBDatabaseCallbacks(nullptr, 0, nullptr),
       abort_called_(false),
       forced_close_called_(false) {}
 
 void MockIndexedDBDatabaseCallbacks::OnForcedClose() {
   forced_close_called_ = true;
 }
 
 void MockIndexedDBDatabaseCallbacks::OnAbort(
     int64_t transaction_id,
     const IndexedDBDatabaseError& error) {
   abort_called_ = true;
 }
 
 }  // namespace content