Revert of Implement AudioReceiveStream::GetStats().

webrtc/audio/conversion.h

-/*
- *  Copyright (c) 2015 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_AUDIO_CONVERSION_H_
-#define WEBRTC_AUDIO_CONVERSION_H_
-
-namespace webrtc {
-
-inline float Q14ToFloat(uint16_t v) {
-  return static_cast<float>(v) / (1 << 14);
-}
-}  // namespace webrtc
-
-#endif  // WEBRTC_AUDIO_CONVERSION_H_