Make update over cellular an option for user

chrome/browser/extensions/api/system_private/system_private_api.cc

 // Copyright (c) 2012 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/extensions/api/system_private/system_private_api.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/macros.h"
@@ skipping 108 matching lines @@
     case chromeos::UpdateEngineClient::UPDATE_STATUS_FINALIZING:
       state = kUpdatingState;
       download_progress = 1;
       break;
     case chromeos::UpdateEngineClient::UPDATE_STATUS_UPDATED_NEED_REBOOT:
       state = kNeedRestartState;
       download_progress = 1;
       break;
     case chromeos::UpdateEngineClient::UPDATE_STATUS_REPORTING_ERROR_EVENT:
     case chromeos::UpdateEngineClient::UPDATE_STATUS_ATTEMPTING_ROLLBACK:
+    case chromeos::UpdateEngineClient::UPDATE_STATUS_NEED_PERMISSION_TO_UPDATE:
       state = kNotAvailableState;
       break;
   }
 #else
   if (UpgradeDetector::GetInstance()->notify_upgrade()) {
     state = kNeedRestartState;
     download_progress = 1;
   } else {
     state = kNotAvailableState;
   }
@@ skipping 31 matching lines @@
   DispatchEvent(extensions::events::SYSTEM_PRIVATE_ON_SCREEN_UNLOCKED,
                 system_private::OnScreenUnlocked::kEventName, nullptr);
 }
 
 void DispatchWokeUpEvent() {
   DispatchEvent(extensions::events::SYSTEM_PRIVATE_ON_WOKE_UP,
                 system_private::OnWokeUp::kEventName, nullptr);
 }
 
 }  // namespace extensions