Refactor AudioParameters member setting.

chrome/browser/media/webrtc_browsertest_audio.cc

 // Copyright 2014 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/media/webrtc_browsertest_audio.h"
 
 #include "base/files/file.h"
 #include "base/files/file_path.h"
 #include "media/audio/audio_parameters.h"
 #include "media/audio/audio_power_monitor.h"
@@ skipping 61 matching lines @@
 
   // Set the filter coefficient to the whole file's duration; this will make the
   // power monitor take the entire file into account.
   media::AudioPowerMonitor power_monitor(wav_audio_handler->sample_rate(),
                                          file_duration);
   power_monitor.Scan(*audio_bus, audio_bus->frames());
 
   file_parameters->Reset(
       media::AudioParameters::AUDIO_PCM_LOW_LATENCY,
       media::GuessChannelLayout(wav_audio_handler->num_channels()),
-      wav_audio_handler->num_channels(), wav_audio_handler->sample_rate(),
-      wav_audio_handler->bits_per_sample(), wav_audio_handler->total_frames());
+      wav_audio_handler->sample_rate(), wav_audio_handler->bits_per_sample(),
+      wav_audio_handler->total_frames());
+  file_parameters->set_channels_for_discrete(wav_audio_handler->num_channels());
 
   return power_monitor.ReadCurrentPowerAndClip().first;
 }
 
 }  // namespace test