Code: media::AudioParameters GetDeviceParametersOnDeviceThread(
    media::AudioManager* audio_manager,
    const std::string& unique_id) {
  DCHECK(audio_manager->GetTaskRunner()->BelongsToCurrentThread());
  return media::AudioDeviceDescription::IsDefaultDevice(unique_id)
             ? audio_manager->GetDefaultOutputStreamParameters()
             : audio_manager->GetOutputStreamParameters(unique_id);
}

Commit Message: Switching AudioOutputAuthorizationHandler from using AudioManager interface to AudioSystem one.

BUG=672468
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2692203003
Cr-Commit-Position: refs/heads/master@{#450939}
CWE ID: 
media::AudioParameters GetDeviceParametersOnDeviceThread(
