ChromeOS: Fix removeUser button on signin screen.

chrome/browser/chromeos/login/signin/device_id_browsertest.cc

Index: chrome/browser/chromeos/login/signin/device_id_browsertest.cc
diff --git a/chrome/browser/chromeos/login/signin/device_id_browsertest.cc b/chrome/browser/chromeos/login/signin/device_id_browsertest.cc
index ad33d485855736bf950d07b9e53e7dbaecd905f3..1a1efdb0cebde9dbcd30277c0b21c5b422e691b6 100644
--- a/chrome/browser/chromeos/login/signin/device_id_browsertest.cc
+++ b/chrome/browser/chromeos/login/signin/device_id_browsertest.cc
@@ -129,9 +129,9 @@ class DeviceIDTest : public OobeBaseTest,
 
  private:
   // user_manager::RemoveUserDelegate:
-  void OnBeforeUserRemoved(const std::string& username) override {}
+  void OnBeforeUserRemoved(const AccountId& account_id) override {}
 
-  void OnUserRemoved(const std::string& username) override {
+  void OnUserRemoved(const AccountId& account_id) override {
     user_removal_loop_.Quit();
   }