ChromeOS: Fix removeUser button on signin screen.

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

 // Copyright 2014 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_CHROME_USER_MANAGER_IMPL_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_USERS_CHROME_USER_MANAGER_IMPL_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 198 matching lines @@
   void RemovePendingBootstrapUser(const std::string& user_id) override;
 
   // Update the number of users.
   void UpdateNumberOfUsers();
 
   // Starts (or stops) automatic timezone refresh on geolocation,
   // depending on user preferences.
   void UpdateUserTimeZoneRefresher(Profile* profile);
 
   // Adds user to the list of the users who should be reported.
-  void AddReportingUser(const std::string& user_id);
+  void AddReportingUser(const AccountId& account_id);
 
   // Removes user from the list of the users who should be reported.
-  void RemoveReportingUser(const std::string& user_id);
+  void RemoveReportingUser(const AccountId& account_id);
 
   // Interface to the signed settings store.
   CrosSettings* cros_settings_;
 
   // Interface to device-local account definitions and associated policy.
   policy::DeviceLocalAccountPolicyService* device_local_account_policy_service_;
 
   content::NotificationRegistrar registrar_;
 
   // User avatar managers.
@@ skipping 28 matching lines @@
   scoped_ptr<BootstrapManager> bootstrap_manager_;
 
   base::WeakPtrFactory<ChromeUserManagerImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeUserManagerImpl);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_USERS_CHROME_USER_MANAGER_IMPL_H_