Revert 179302

ui/app_list/signin_delegate.cc

-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "ui/app_list/signin_delegate.h"
-#include "ui/app_list/signin_delegate_observer.h"
-
-namespace app_list {
-
-SigninDelegate::SigninDelegate() {}
-
-SigninDelegate::~SigninDelegate() {}
-
-void SigninDelegate::AddObserver(SigninDelegateObserver* observer) {
-  observers_.AddObserver(observer);
-}
-
-void SigninDelegate::RemoveObserver(SigninDelegateObserver* observer) {
-  observers_.RemoveObserver(observer);
-}
-
-void SigninDelegate::NotifySigninSuccess() {
-  FOR_EACH_OBSERVER(app_list::SigninDelegateObserver, observers_,
-                    OnSigninSuccess());
-}
-
-}  // namespace app_list