Final cleanup pass over audio device API

extensions/test/data/api_test/audio/add_nodes/background.js

 // 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.
 
 chrome.test.runTests([
   function waitForDeviceChangedEventTests() {
-    chrome.test.listenOnce(chrome.audio.OnDevicesChanged, function(devices) {
+    chrome.test.listenOnce(chrome.audio.onDeviceListChanged, function(devices) {
       var deviceList = devices.map(function(device) {
         return {
           id: device.id,
           stableDeviceId: device.stableDeviceId,
           isInput: device.isInput,
           deviceType: device.deviceType,
           deviceName: device.deviceName,
           displayName: device.displayName
         };
       }).sort(function(lhs, rhs) {
@@ skipping 20 matching lines @@
         isInput: false,
         deviceType: 'HDMI',
         deviceName: 'HDMI output',
         displayName: 'HDA Intel MID'
       }], deviceList);
     });
   }
 ]);
 
 chrome.test.sendMessage('loaded');