cros: Remove supervised user methods from SystemTrayDelegate

chrome/browser/chromeos/login/users/fake_chrome_user_manager.h

Index: chrome/browser/chromeos/login/users/fake_chrome_user_manager.h
diff --git a/chrome/browser/chromeos/login/users/fake_chrome_user_manager.h b/chrome/browser/chromeos/login/users/fake_chrome_user_manager.h
index 0e814ae9eb20e0ccaa7cf1d6fa1f0a54c03a1d8c..8f5e7e3608f34d96e9a702ef6cf589157f73b62d 100644
--- a/chrome/browser/chromeos/login/users/fake_chrome_user_manager.h
+++ b/chrome/browser/chromeos/login/users/fake_chrome_user_manager.h
@@ -28,14 +28,16 @@ class FakeChromeUserManager : public ChromeUserManager {
   FakeChromeUserManager();
   ~FakeChromeUserManager() override;
 
-  // Create and add a kiosk app user.
+  // Create and add various types of users.
   user_manager::User* AddKioskAppUser(const AccountId& account_id);
   user_manager::User* AddArcKioskAppUser(const AccountId& account_id);
-
-  // Create and add a public account user.
+  user_manager::User* AddSupervisedUser(const AccountId& account_id);
   const user_manager::User* AddPublicAccountUser(const AccountId& account_id);
 
   // Calculates the user name hash and calls UserLoggedIn to login a user.
+  // Sets the user as having its profile created, but does not create a profile.
+  // NOTE: This does not match production, which first logs in the user, then
+  // creates the profile and updates the user later.
   void LoginUser(const AccountId& account_id);
 
   const user_manager::User* AddUser(const AccountId& account_id);