Revert of Add account_type into AccountId

chrome/browser/chromeos/login/screens/chrome_user_selection_screen.cc

Index: chrome/browser/chromeos/login/screens/chrome_user_selection_screen.cc
diff --git a/chrome/browser/chromeos/login/screens/chrome_user_selection_screen.cc b/chrome/browser/chromeos/login/screens/chrome_user_selection_screen.cc
index affc58b8f2755999ed826ca0614aa9c3f0724b0e..9362462eea161d8dd201b989c60268167e415144 100644
--- a/chrome/browser/chromeos/login/screens/chrome_user_selection_screen.cc
+++ b/chrome/browser/chromeos/login/screens/chrome_user_selection_screen.cc
@@ -85,8 +85,8 @@
 
 void ChromeUserSelectionScreen::CheckForPublicSessionDisplayNameChange(
     policy::DeviceLocalAccountPolicyBroker* broker) {
-  const AccountId& account_id = user_manager::known_user::GetAccountId(
-      broker->user_id(), std::string() /* id */, AccountType::UNKNOWN);
+  const AccountId& account_id =
+      user_manager::known_user::GetAccountId(broker->user_id(), std::string());
   DCHECK(account_id.is_valid());
   const std::string& display_name = broker->GetDisplayName();
   if (display_name == public_session_display_names_[account_id])
@@ -116,8 +116,8 @@
 
 void ChromeUserSelectionScreen::CheckForPublicSessionLocalePolicyChange(
     policy::DeviceLocalAccountPolicyBroker* broker) {
-  const AccountId& account_id = user_manager::known_user::GetAccountId(
-      broker->user_id(), std::string() /* id */, AccountType::UNKNOWN);
+  const AccountId& account_id =
+      user_manager::known_user::GetAccountId(broker->user_id(), std::string());
   DCHECK(account_id.is_valid());
   const policy::PolicyMap::Entry* entry =
       broker->core()->store()->policy_map().Get(policy::key::kSessionLocales);