Reimplement the builtin audio codec factories using the new stuff in api/

webrtc/api/audio_codecs/g722/audio_decoder_g722.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/api/audio_codecs/g722/audio_decoder_g722.h"
 
 #include <memory>
 #include <vector>
 
 #include "webrtc/common_types.h"
 #include "webrtc/modules/audio_coding/codecs/g722/audio_decoder_g722.h"
 #include "webrtc/rtc_base/ptr_util.h"
 #include "webrtc/rtc_base/safe_conversions.h"
 
 namespace webrtc {
 
 rtc::Optional<AudioDecoderG722::Config> AudioDecoderG722::SdpToConfig(
     const SdpAudioFormat& format) {
-  return STR_CASE_CMP(format.name.c_str(), "g722") == 0 &&
+  return STR_CASE_CMP(format.name.c_str(), "G722") == 0 &&
                  format.clockrate_hz == 8000 &&
                  (format.num_channels == 1 || format.num_channels == 2)
              ? rtc::Optional<Config>(
                    Config{rtc::dchecked_cast<int>(format.num_channels)})
              : rtc::Optional<Config>();
 }
 
 void AudioDecoderG722::AppendSupportedDecoders(
     std::vector<AudioCodecSpec>* specs) {
-  specs->push_back({{"g722", 8000, 1}, {16000, 1, 64000}});
+  specs->push_back({{"G722", 8000, 1}, {16000, 1, 64000}});
 }
 
 std::unique_ptr<AudioDecoder> AudioDecoderG722::MakeAudioDecoder(
     Config config) {
   switch (config.num_channels) {
     case 1:
       return rtc::MakeUnique<AudioDecoderG722Impl>();
     case 2:
       return rtc::MakeUnique<AudioDecoderG722StereoImpl>();
     default:
       return nullptr;
   }
 }
 
 }  // namespace webrtc