Fix ALSA unit test

Fixes small conflict after crrev.com/c/1036524.

Bug: None
Test: cast_media_unittests
Change-Id: Ib0a83c0074c6f9f7b9532cefe10c7331ec11e645
Reviewed-on: https://chromium-review.googlesource.com/1160932
Commit-Queue: Aidan Wolter <awolter@chromium.org>
Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580251}

chromecast/media/audio/cast_audio_manager_alsa_unittest.cc

@@ -24,7 +24,6 @@ const ::media::AudioParameters kDefaultAudioParams(
     ::media::AudioParameters::AUDIO_PCM_LOW_LATENCY,
     ::media::CHANNEL_LAYOUT_STEREO,
     ::media::AudioParameters::kAudioCDSampleRate,
-    16,
     256);
 
 void OnLogMessage(const std::string& message) {}