Move AudioDecoder and related stuff to the api/ directory

webrtc/modules/audio_coding/codecs/internal_builtin_audio_decoder_factory.h

Index: webrtc/modules/audio_coding/codecs/internal_builtin_audio_decoder_factory.h
diff --git a/webrtc/modules/audio_coding/codecs/audio_format_conversion.h b/webrtc/modules/audio_coding/codecs/internal_builtin_audio_decoder_factory.h
similarity index 50%
copy from webrtc/modules/audio_coding/codecs/audio_format_conversion.h
copy to webrtc/modules/audio_coding/codecs/internal_builtin_audio_decoder_factory.h
index 9267a52b729d02ca002e987ad72db096b388beb2..172ff2ad776c9c10309be6516eae76c098e73348 100644
--- a/webrtc/modules/audio_coding/codecs/audio_format_conversion.h
+++ b/webrtc/modules/audio_coding/codecs/internal_builtin_audio_decoder_factory.h
@@ -8,17 +8,17 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#ifndef WEBRTC_MODULES_AUDIO_CODING_CODECS_AUDIO_FORMAT_CONVERSION_H_
-#define WEBRTC_MODULES_AUDIO_CODING_CODECS_AUDIO_FORMAT_CONVERSION_H_
+#ifndef WEBRTC_MODULES_AUDIO_CODING_CODECS_INTERNAL_BUILTIN_AUDIO_DECODER_FACTORY_H_
+#define WEBRTC_MODULES_AUDIO_CODING_CODECS_INTERNAL_BUILTIN_AUDIO_DECODER_FACTORY_H_
 
-#include "webrtc/common_types.h"
-#include "webrtc/modules/audio_coding/codecs/audio_format.h"
+#include "webrtc/api/audio_codec/audio_decoder_factory.h"
+#include "webrtc/base/scoped_ref_ptr.h"
 
 namespace webrtc {
 
-SdpAudioFormat CodecInstToSdp(const CodecInst& codec_inst);
-CodecInst SdpToCodecInst(int payload_type, const SdpAudioFormat& audio_format);
+rtc::scoped_refptr<AudioDecoderFactory>
+InternalCreateBuiltinAudioDecoderFactory();
 
 }  // namespace webrtc
 
-#endif  // WEBRTC_MODULES_AUDIO_CODING_CODECS_AUDIO_FORMAT_CONVERSION_H_
+#endif  // WEBRTC_MODULES_AUDIO_CODING_CODECS_INTERNAL_BUILTIN_AUDIO_DECODER_FACTORY_H_