Revert of Opus implementation of the AudioEncoderFactoryTemplate API

webrtc/api/audio_codecs/opus/audio_encoder_opus.h

Index: webrtc/api/audio_codecs/opus/audio_encoder_opus.h
diff --git a/webrtc/api/audio_codecs/opus/audio_encoder_opus.h b/webrtc/api/audio_codecs/opus/audio_encoder_opus.h
deleted file mode 100644
index e5bee31646ec6332109ac25da1048d11598571da..0000000000000000000000000000000000000000
--- a/webrtc/api/audio_codecs/opus/audio_encoder_opus.h
+++ /dev/null
@@ -1,40 +0,0 @@
-/*
- *  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.
- */
-
-#ifndef WEBRTC_API_AUDIO_CODECS_OPUS_AUDIO_ENCODER_OPUS_H_
-#define WEBRTC_API_AUDIO_CODECS_OPUS_AUDIO_ENCODER_OPUS_H_
-
-#include <memory>
-#include <vector>
-
-#include "webrtc/api/audio_codecs/audio_encoder.h"
-#include "webrtc/api/audio_codecs/audio_format.h"
-#include "webrtc/api/audio_codecs/opus/audio_encoder_opus_config.h"
-#include "webrtc/base/optional.h"
-
-namespace webrtc {
-
-// Opus encoder API for use as a template parameter to
-// CreateAudioEncoderFactory<...>().
-//
-// NOTE: This struct is still under development and may change without notice.
-struct AudioEncoderOpus {
-  static rtc::Optional<AudioEncoderOpusConfig> SdpToConfig(
-      const SdpAudioFormat& audio_format);
-  static void AppendSupportedEncoders(std::vector<AudioCodecSpec>* specs);
-  static AudioCodecInfo QueryAudioEncoder(const AudioEncoderOpusConfig& config);
-  static std::unique_ptr<AudioEncoder> MakeAudioEncoder(
-      const AudioEncoderOpusConfig&,
-      int payload_type);
-};
-
-}  // namespace webrtc
-
-#endif  // WEBRTC_API_AUDIO_CODECS_OPUS_AUDIO_ENCODER_OPUS_H_