[Password Manager Cleanup] Replaces NULL -> nullptr.

components/password_manager/core/browser/webdata/password_web_data_service_win.cc

 // Copyright 2014 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 "components/password_manager/core/browser/webdata/password_web_data_service_win.h"
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "components/os_crypt/ie7_password_win.h"
 #include "components/password_manager/core/browser/webdata/logins_table.h"
@@ skipping 47 matching lines @@
   IE7PasswordInfo result;
   LoginsTable::FromWebDatabase(db)->GetIE7Login(info, &result);
   return scoped_ptr<WDTypedResult>(
       new WDResult<IE7PasswordInfo>(PASSWORD_IE7_RESULT, result));
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 
 PasswordWebDataService::PasswordWebDataService(
     scoped_refptr<base::MessageLoopProxy> ui_thread)
-    : WebDataServiceBase(NULL, ProfileErrorCallback(), ui_thread) {
+    : WebDataServiceBase(nullptr, ProfileErrorCallback(), ui_thread) {
 }
 
 PasswordWebDataService::~PasswordWebDataService() {
 }