Remove webrtc/sound/ subdir.

webrtc/sound/linuxsoundsystem.h

-/*
- *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#ifndef WEBRTC_SOUND_LINUXSOUNDSYSTEM_H_
-#define WEBRTC_SOUND_LINUXSOUNDSYSTEM_H_
-
-#include "webrtc/base/arraysize.h"
-#include "webrtc/sound/automaticallychosensoundsystem.h"
-
-namespace rtc {
-
-extern const SoundSystemCreator kLinuxSoundSystemCreators[
-#ifdef HAVE_LIBPULSE
-    2
-#else
-    1
-#endif
-    ];
-
-// The vast majority of Linux systems use ALSA for the device-level sound API,
-// but an increasing number are using PulseAudio for the application API and
-// only using ALSA internally in PulseAudio itself. But like everything on
-// Linux this is user-configurable, so we need to support both and choose the
-// right one at run-time.
-// PulseAudioSoundSystem is designed to only successfully initialize if
-// PulseAudio is installed and running, and if it is running then direct device
-// access using ALSA typically won't work, so if PulseAudioSoundSystem
-// initializes then we choose that. Otherwise we choose ALSA.
-typedef AutomaticallyChosenSoundSystem<
-    kLinuxSoundSystemCreators,
-    arraysize(kLinuxSoundSystemCreators)> LinuxSoundSystem;
-
-}  // namespace rtc
-
-#endif  // WEBRTC_SOUND_LINUXSOUNDSYSTEM_H_