[cros] pyauto.CancelOOBEUpdate always returns a non-empty dict with 'next_screen'.

chrome/browser/automation/testing_automation_provider.h

 // 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.
 
 #ifndef CHROME_BROWSER_AUTOMATION_TESTING_AUTOMATION_PROVIDER_H_
 #define CHROME_BROWSER_AUTOMATION_TESTING_AUTOMATION_PROVIDER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 1423 matching lines @@
   // Accepts or declines EULA, moving forward or back from EULA screen.
   // Example:
   //    input: { "accepted": true, "usage_stats_reporting": false }
   //    output: { "next_screen": "update" }
   void AcceptOOBEEula(base::DictionaryValue* args, IPC::Message* reply_message);
 
   // Forces the ongoing update to cancel and proceed to the login screen.
   // Example:
   //    input: none
   //    output: { "next_screen": "login" }
-  //    output: none (if update was not running)
   void CancelOOBEUpdate(base::DictionaryValue* args,
                         IPC::Message* reply_message);
 
   // Chooses user image on the image picker screen and starts browser session.
   // Example:
   //    input: { "image": "profile" } - Google profile image
   //    input: { "image": 2 } - default image number 2 (0-based)
   //    output: { "next_screen": "session" }
   void PickUserImage(base::DictionaryValue* args, IPC::Message* reply_message);
 
@@ skipping 199 matching lines @@
   scoped_ptr<AutomationEventQueue> automation_event_queue_;
 
   // List of commands which just finish synchronously and don't require
   // setting up an observer.
   static const int kSynchronousCommands[];
 
   DISALLOW_COPY_AND_ASSIGN(TestingAutomationProvider);
 };
 
 #endif  // CHROME_BROWSER_AUTOMATION_TESTING_AUTOMATION_PROVIDER_H_