Switching WebRTC browser test from AudioManager::HasAudioOutputDevices() to AudioSystem interface.

media/audio/audio_system.h

 // Copyright 2017 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 MEDIA_AUDIO_AUDIO_SYSTEM_H_
 #define MEDIA_AUDIO_AUDIO_SYSTEM_H_
 
 #include "base/callback.h"
 #include "media/audio/audio_device_description.h"
 #include "media/base/audio_parameters.h"
@@ skipping 38 matching lines @@
   // not found. This is best-effort: valid parameters do not guarantee existance
   // of the device.
   // TODO(olka,tommi): fix all AudioManager implementations to return invalid
   // parameters if the device is not found.
   virtual void GetOutputStreamParameters(
       const std::string& device_id,
       OnAudioParamsCallback on_params_cb) const = 0;
 
   virtual void HasInputDevices(OnBoolCallback on_has_devices_cb) const = 0;
 
+  virtual void HasOutputDevices(OnBoolCallback on_has_devices_cb) const = 0;
+
   // Replies with device descriptions of input audio devices if |for_input| is
   // true, and of output audio devices otherwise.
   virtual void GetDeviceDescriptions(
       OnDeviceDescriptionsCallback on_descriptions_cp,
       bool for_input) = 0;
 
   virtual base::SingleThreadTaskRunner* GetTaskRunner() const = 0;
 
   // Must not be used for anything but stream creation.
   virtual AudioManager* GetAudioManager() const = 0;
 
  protected:
   // Sets the global AudioSystem pointer to the specified non-null value.
   static void SetInstance(AudioSystem* audio_system);
 
   // Sets the global AudioSystem pointer to null if it equals the specified one.
   static void ClearInstance(const AudioSystem* audio_system);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_SYSTEM_H_