Injectable audio encoders: Moved audio encoder, factory and builtin factory to api/.

webrtc/api/audio_codecs/audio_encoder_factory.h

 /*
  *  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_MODULES_AUDIO_CODING_CODECS_AUDIO_ENCODER_FACTORY_H_
-#define WEBRTC_MODULES_AUDIO_CODING_CODECS_AUDIO_ENCODER_FACTORY_H_
+#ifndef WEBRTC_API_AUDIO_CODECS_AUDIO_ENCODER_FACTORY_H_
+#define WEBRTC_API_AUDIO_CODECS_AUDIO_ENCODER_FACTORY_H_
 
 #include <memory>
 #include <vector>
 
+#include "webrtc/api/audio_codecs/audio_encoder.h"
 #include "webrtc/api/audio_codecs/audio_format.h"
 #include "webrtc/base/refcount.h"
-#include "webrtc/modules/audio_coding/codecs/audio_encoder.h"
 
 namespace webrtc {
 
 // A factory that creates AudioEncoders.
 // NOTE: This class is still under development and may change without notice.
 class AudioEncoderFactory : public rtc::RefCountInterface {
  public:
   // Returns a prioritized list of audio codecs, to use for signaling etc.
   virtual std::vector<AudioCodecSpec> GetSupportedEncoders() = 0;
 
   // Returns information about how this format would be encoded, provided it's
   // supported. More format and format variations may be supported than those
   // returned by GetSupportedEncoders().
   virtual rtc::Optional<AudioCodecInfo> QueryAudioEncoder(
       const SdpAudioFormat& format) = 0;
 
   // Creates an AudioEncoder for the specified format. The encoder will tags its
   // payloads with the specified payload type.
   // TODO(ossu): Try to avoid audio encoders having to know their payload type.
   virtual std::unique_ptr<AudioEncoder> MakeAudioEncoder(
       int payload_type,
       const SdpAudioFormat& format) = 0;
 };
 
 }  // namespace webrtc
 
-#endif  // WEBRTC_MODULES_AUDIO_CODING_CODECS_AUDIO_ENCODER_FACTORY_H_
+#endif  // WEBRTC_API_AUDIO_CODECS_AUDIO_ENCODER_FACTORY_H_