Remove unused LoginPerformer::Delegate setter and member.

chrome/browser/chromeos/login/existing_user_controller.h

Index: chrome/browser/chromeos/login/existing_user_controller.h
diff --git a/chrome/browser/chromeos/login/existing_user_controller.h b/chrome/browser/chromeos/login/existing_user_controller.h
index ed8cb7ec7b7527edfc41b7fa94e3a21ebddcc79f..4dfe7e4b9d347388b7d59824e57756fdb8ef2713 100644
--- a/chrome/browser/chromeos/login/existing_user_controller.h
+++ b/chrome/browser/chromeos/login/existing_user_controller.h
@@ -214,10 +214,6 @@ class ExistingUserController : public LoginDisplay::Delegate,
   void PerformLogin(const UserContext& user_context,
                     LoginPerformer::AuthorizationMode auth_mode);
 
-  void set_login_performer_delegate(LoginPerformer::Delegate* d) {
-    login_performer_delegate_.reset(d);
-  }
-
   // Updates the |login_display_| attached to this controller.
   void UpdateLoginDisplay(const user_manager::UserList& users);
 
@@ -236,10 +232,6 @@ class ExistingUserController : public LoginDisplay::Delegate,
   // Used to execute login operations.
   scoped_ptr<LoginPerformer> login_performer_;
 
-  // Delegate for login performer to be overridden by tests.
-  // |this| is used if |login_performer_delegate_| is NULL.
-  scoped_ptr<LoginPerformer::Delegate> login_performer_delegate_;
-
   // Delegate to forward all authentication status events to.
   // Tests can use this to receive authentication status events.
   AuthStatusConsumer* auth_status_consumer_;