This CL replaces user_manager::UserID with AccountId.

chrome/browser/chromeos/extensions/users_private/users_private_api.cc

 // 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.
 
 #include "chrome/browser/chromeos/extensions/users_private/users_private_api.h"
 
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chromeos/extensions/users_private/users_private_delegate.h"
 #include "chrome/browser/chromeos/extensions/users_private/users_private_delegate_factory.h"
@@ skipping 152 matching lines @@
     return RespondNow(OneArgument(new base::FundamentalValue(false)));
   }
 
   base::StringValue canonical_email(gaia::CanonicalizeEmail(parameters->email));
 
   UsersPrivateDelegate* delegate =
       UsersPrivateDelegateFactory::GetForBrowserContext(browser_context());
   PrefsUtil* prefs_util = delegate->GetPrefsUtil();
   bool removed = prefs_util->RemoveFromListCrosSetting(
       chromeos::kAccountsPrefUsers, canonical_email);
-  user_manager::UserManager::Get()->RemoveUser(parameters->email, NULL);
+  user_manager::UserManager::Get()->RemoveUser(
+      AccountId::FromUserEmail(parameters->email), NULL);
   return RespondNow(OneArgument(new base::FundamentalValue(removed)));
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // UsersPrivateIsCurrentUserOwnerFunction
 
 UsersPrivateIsCurrentUserOwnerFunction::UsersPrivateIsCurrentUserOwnerFunction()
     : chrome_details_(this) {
 }
 
@@ skipping 21 matching lines @@
 
 ExtensionFunction::ResponseAction
 UsersPrivateIsWhitelistManagedFunction::Run() {
   bool is_managed = g_browser_process->platform_part()
                         ->browser_policy_connector_chromeos()
                         ->IsEnterpriseManaged();
   return RespondNow(OneArgument(new base::FundamentalValue(is_managed)));
 }
 
 }  // namespace extensions