Refactored how WebRTC content browser tests talk to their javascript.

content/test/data/media/webrtc_test_audio.js

 // Copyright 2013 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.
 
 // Audio test utilities.
 
 // Gathers |numSamples| samples at |frequency| number of times per second and
 // calls back |callback| with an array with numbers in the [0, 32768] range.
 function gatherAudioLevelSamples(peerConnection, numSamples, frequency,
                                  callback) {
@@ skipping 52 matching lines @@
 function getAudioLevelFromStats_(response) {
   var reports = response.result();
   var audioOutputLevels = [];
   for (var i = 0; i < reports.length; ++i) {
     var report = reports[i];
     if (report.names().indexOf('audioOutputLevel') != -1) {
       audioOutputLevels.push(report.stat('audioOutputLevel'));
     }
   }
   // Should only be one audio level reported, otherwise we get confused.
-  expectEquals(1, audioOutputLevels.length);
+  assertEquals(1, audioOutputLevels.length);
 
   return audioOutputLevels[0];
 }