Revert of L16 implementation of the Audio{En,De}coderFactoryTemplate APIs

webrtc/modules/audio_coding/codecs/pcm16b/pcm16b_common.cc

-/*
- *  Copyright (c) 2017 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.
- */
-
-#include "webrtc/modules/audio_coding/codecs/pcm16b/pcm16b_common.h"
-
-namespace webrtc {
-
-void Pcm16BAppendSupportedCodecSpecs(std::vector<AudioCodecSpec>* specs) {
-  for (size_t num_channels : {1, 2}) {
-    for (int sample_rate_hz : {8000, 16000, 32000}) {
-      specs->push_back(
-          {{"L16", sample_rate_hz, num_channels},
-           {sample_rate_hz, num_channels, sample_rate_hz * num_channels * 16}});
-    }
-  }
-}
-
-}  // namespace webrtc