Rewrite simple uses of base::ListValue::Append(base::Value*) on CrOS.

chrome/browser/chromeos/login/users/chrome_user_manager_impl.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 "chrome/browser/chromeos/login/users/chrome_user_manager_impl.h"
 
 #include <stddef.h>
 
 #include <cstddef>
 #include <set>
@@ skipping 695 matching lines @@
     for (user_manager::UserList::iterator it = users_.begin();
          it != users_.end();) {
       const AccountId account_id = (*it)->GetAccountId();
       if ((*it)->HasGaiaAccount() && account_id != GetOwnerAccountId()) {
         RemoveNonCryptohomeData(account_id);
         DeleteUser(*it);
         it = users_.erase(it);
         changed = true;
       } else {
         if ((*it)->GetType() != user_manager::USER_TYPE_PUBLIC_ACCOUNT)
-          prefs_users_update->Append(
-              new base::StringValue(account_id.GetUserEmail()));
+          prefs_users_update->AppendString(account_id.GetUserEmail());
         ++it;
       }
     }
   }
 
   if (changed)
     NotifyUserListChanged();
 }
 
 void ChromeUserManagerImpl::GuestUserLoggedIn() {
@@ skipping 615 matching lines @@
       break;
     default:
       NOTREACHED();
       break;
   }
 
   return user;
 }
 
 }  // namespace chromeos