This CL replaces e-mail with AccountId on user selection screen.

chrome/browser/chromeos/login/signin_screen_controller.cc

Index: chrome/browser/chromeos/login/signin_screen_controller.cc
diff --git a/chrome/browser/chromeos/login/signin_screen_controller.cc b/chrome/browser/chromeos/login/signin_screen_controller.cc
index fdcfd5acc2426826152a93a70b587979b95ad964..eb0985261098aa611a3e20412ad0cf72c9944b85 100644
--- a/chrome/browser/chromeos/login/signin_screen_controller.cc
+++ b/chrome/browser/chromeos/login/signin_screen_controller.cc
@@ -75,8 +75,8 @@ void SignInScreenController::SendUserList() {
   user_selection_screen_->HandleGetUsers();
 }
 
-void SignInScreenController::CheckUserStatus(const std::string& user_id) {
-  user_selection_screen_->CheckUserStatus(user_id);
+void SignInScreenController::CheckUserStatus(const AccountId& account_id) {
+  user_selection_screen_->CheckUserStatus(account_id);
 }
 
 void SignInScreenController::SetWebUIHandler(