Pass Callback to TaskRunner by value and consume it on invocation (1)

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

 // Copyright 2015 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_USERS_FAKE_CHROME_USER_MANAGER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_USERS_FAKE_CHROME_USER_MANAGER_H_
 
 #include <map>
 #include <memory>
 #include <string>
 
+#include "base/callback_forward.h"
 #include "base/macros.h"
 #include "chrome/browser/chromeos/login/user_flow.h"
 #include "chrome/browser/chromeos/login/users/chrome_user_manager.h"
 #include "components/user_manager/fake_user_manager.h"
 #include "components/user_manager/user.h"
 #include "components/user_manager/user_image/user_image.h"
 
 namespace chromeos {
 
 class FakeSupervisedUserManager;
@@ skipping 184 matching lines @@
   // Specific flows by user e-mail.
   // Keys should be canonicalized before access.
   FlowMap specific_flows_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeChromeUserManager);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_USERS_FAKE_CHROME_USER_MANAGER_H_