Revert of Add account_type into AccountId

components/user_manager/user_manager_base.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/user_manager/user_manager_base.h"
 
 #include <stddef.h>
 #include <set>
 #include <utility>
 
@@ skipping 476 matching lines @@
                                     std::set<AccountId>* users_set) {
   users_vector->clear();
   users_set->clear();
   for (size_t i = 0; i < users_list.GetSize(); ++i) {
     std::string email;
     if (!users_list.GetString(i, &email) || email.empty()) {
       LOG(ERROR) << "Corrupt entry in user list at index " << i << ".";
       continue;
     }
 
-    const AccountId account_id = known_user::GetAccountId(
-        email, std::string() /* id */, AccountType::UNKNOWN);
+    const AccountId account_id = known_user::GetAccountId(email, std::string());
 
     if (existing_users.find(account_id) != existing_users.end() ||
         !users_set->insert(account_id).second) {
       LOG(ERROR) << "Duplicate user: " << email;
       continue;
     }
     users_vector->push_back(account_id);
   }
 }
 
@@ skipping 577 matching lines @@
 }
 
 void UserManagerBase::DeleteUser(User* user) {
   const bool is_active_user = (user == active_user_);
   delete user;
   if (is_active_user)
     active_user_ = nullptr;
 }
 
 }  // namespace user_manager