Rename --enable-default-media-session to --enable-audio-focus.

chrome/browser/resources/chromeos/chromevox/cvox2/background/media_automation_handler.js

 // Copyright 2016 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.
 
 /**
  * @fileoverview Handles media automation events.  Note that to perform any of
  * the actions below such as ducking, and suspension of media sessions, the
- * --enable-default-media-session flag must be passed at the command line.
+ * --enable-audio-focus flag must be passed at the command line.
  */
 
 goog.provide('MediaAutomationHandler');
 
 goog.require('BaseAutomationHandler');
 goog.require('cvox.TtsCapturingEventListener');
 
 goog.scope(function() {
 var AutomationEvent = chrome.automation.AutomationEvent;
 var AutomationNode = chrome.automation.AutomationNode;
@@ skipping 94 matching lines @@
           root.resumeMedia();
       }
       item = it.next();
     }
   }
 };
 
 });  // goog.scope
 
 new MediaAutomationHandler();