Remove webrtc/sound/ subdir.

webrtc/sound/nullsoundsystem.h

Index: webrtc/sound/nullsoundsystem.h
diff --git a/webrtc/sound/nullsoundsystem.h b/webrtc/sound/nullsoundsystem.h
deleted file mode 100644
index 08ffad1015e2bf707bb02e46486f5c18ba23f04e..0000000000000000000000000000000000000000
--- a/webrtc/sound/nullsoundsystem.h
+++ /dev/null
@@ -1,53 +0,0 @@
-/*
- *  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_NULLSOUNDSYSTEM_H_
-#define WEBRTC_SOUND_NULLSOUNDSYSTEM_H_
-
-#include "webrtc/sound/soundsysteminterface.h"
-
-namespace rtc {
-
-class SoundDeviceLocator;
-class SoundInputStreamInterface;
-class SoundOutputStreamInterface;
-
-// A simple reference sound system that drops output samples and generates
-// no input samples.
-class NullSoundSystem : public SoundSystemInterface {
- public:
-  static SoundSystemInterface *Create() {
-    return new NullSoundSystem();
-  }
-
-  ~NullSoundSystem() override;
-
-  bool Init() override;
-  void Terminate() override;
-
-  bool EnumeratePlaybackDevices(SoundDeviceLocatorList *devices) override;
-  bool EnumerateCaptureDevices(SoundDeviceLocatorList *devices) override;
-
-  SoundOutputStreamInterface *OpenPlaybackDevice(
-      const SoundDeviceLocator *device,
-      const OpenParams &params) override;
-  SoundInputStreamInterface *OpenCaptureDevice(
-      const SoundDeviceLocator *device,
-      const OpenParams &params) override;
-
-  bool GetDefaultPlaybackDevice(SoundDeviceLocator **device) override;
-  bool GetDefaultCaptureDevice(SoundDeviceLocator **device) override;
-
-  const char *GetName() const override;
-};
-
-}  // namespace rtc
-
-#endif  // WEBRTC_SOUND_NULLSOUNDSYSTEM_H_