This CL replaces e-mail with AccountId in easy signin code.

chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc

Index: chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
diff --git a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
index a1f1a7223b23bea666b926cc7d9d94c3c0e90a87..323bf17cc7203494b8877110c53bddc9a643ab30 100644
--- a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
+++ b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
@@ -296,7 +296,7 @@ SigninScreenHandler::~SigninScreenHandler() {
     max_mode_delegate_.reset(nullptr);
   }
   proximity_auth::ScreenlockBridge::Get()->SetLockHandler(nullptr);
-  proximity_auth::ScreenlockBridge::Get()->SetFocusedUser("");
+  proximity_auth::ScreenlockBridge::Get()->SetFocusedUser(EmptyAccountId());
 }
 
 // static
@@ -1241,8 +1241,7 @@ void SigninScreenHandler::HandleShowLoadingTimeoutError() {
 void SigninScreenHandler::HandleFocusPod(const AccountId& account_id) {
   SetUserInputMethod(account_id.GetUserEmail(), ime_state_.get());
   WallpaperManager::Get()->SetUserWallpaperDelayed(account_id.GetUserEmail());
-  proximity_auth::ScreenlockBridge::Get()->SetFocusedUser(
-      account_id.GetUserEmail());
+  proximity_auth::ScreenlockBridge::Get()->SetFocusedUser(account_id);
   if (delegate_)
     delegate_->CheckUserStatus(account_id);
   if (!test_focus_pod_callback_.is_null())