Revert of This CL replaces user_manager::UserID with AccountId.

chrome/browser/chromeos/ownership/owner_settings_service_chromeos.cc

 // 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.
 
 #include "chrome/browser/chromeos/ownership/owner_settings_service_chromeos.h"
 
 #include <keyhi.h>
 
 #include <algorithm>
 #include <string>
@@ skipping 703 matching lines @@
 
     LOG(FATAL) << "Device setting " << path << " is read-only.";
   }
 }
 
 void OwnerSettingsServiceChromeOS::OnPostKeypairLoadedActions() {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   const user_manager::User* user =
       ProfileHelper::Get()->GetUserByProfile(profile_);
-  user_id_ = user ? user->GetAccountId().GetUserEmail() : std::string();
+  user_id_ = user ? user->GetUserID() : std::string();
 
   const bool is_owner = IsOwner() || IsOwnerInTests(user_id_);
   if (is_owner && device_settings_service_)
     device_settings_service_->InitOwner(user_id_, weak_factory_.GetWeakPtr());
 
   has_pending_fixups_ = true;
 }
 
 void OwnerSettingsServiceChromeOS::ReloadKeypairImpl(const base::Callback<
     void(const scoped_refptr<PublicKey>& public_key,
@@ skipping 79 matching lines @@
   std::vector<OnManagementSettingsSetCallback> callbacks;
   pending_management_settings_callbacks_.swap(callbacks);
   for (const auto& callback : callbacks) {
     if (!callback.is_null())
       callback.Run(success);
   }
   StorePendingChanges();
 }
 
 }  // namespace chromeos