Removing AudioCoding class, a.k.a the new ACM API

webrtc/modules/audio_coding/main/acm2/audio_coding_module.cc

 /*
  *  Copyright (c) 2012 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.
  */
 
@@ skipping 82 matching lines @@
 
   if (codec_number < 0) {
     WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceAudioCoding, -1,
                  "Invalid codec setting");
     return false;
   } else {
     return true;
   }
 }
 
-AudioCoding::Config::Config()
-    : neteq_config(),
-      clock(Clock::GetRealTimeClock()),
-      transport(nullptr),
-      vad_callback(nullptr),
-      initial_playout_delay_ms(0),
-      playout_channels(1),
-      playout_frequency_hz(32000) {
-}
-
-AudioCoding* AudioCoding::Create(const Config& config) {
-  return new AudioCodingImpl(config);
-}
-
 }  // namespace webrtc