Linux: Do not use a hard coded app name for PulseAudio output.

media/audio/pulse/pulse_util.h

Index: media/audio/pulse/pulse_util.h
diff --git a/media/audio/pulse/pulse_util.h b/media/audio/pulse/pulse_util.h
index 791d6ade83a8f1293fa2ad3dad98091425f679b1..94c4aa4a44627bd2ee86429f349bfc77e58a16b8 100644
--- a/media/audio/pulse/pulse_util.h
+++ b/media/audio/pulse/pulse_util.h
@@ -70,6 +70,7 @@ bool CreateOutputStream(pa_threaded_mainloop** mainloop,
                         pa_stream** stream,
                         const AudioParameters& params,
                         const std::string& device_id,
+                        const std::string& app_name,
                         pa_stream_notify_cb_t stream_callback,
                         pa_stream_request_cb_t write_callback,
                         void* user_data);