Move AudioDecoder and related stuff to the api/ directory

webrtc/modules/audio_coding/codecs/builtin_audio_decoder_factory_internal.h

Index: webrtc/modules/audio_coding/codecs/builtin_audio_decoder_factory_internal.h
diff --git a/webrtc/modules/audio_coding/codecs/builtin_audio_decoder_factory.h b/webrtc/modules/audio_coding/codecs/builtin_audio_decoder_factory_internal.h
similarity index 65%
copy from webrtc/modules/audio_coding/codecs/builtin_audio_decoder_factory.h
copy to webrtc/modules/audio_coding/codecs/builtin_audio_decoder_factory_internal.h
index 7bc35863cb03483da21d2e7f254ce8107bae5c5f..10f356affc4289919bd61154da67cac0b82f7b24 100644
--- a/webrtc/modules/audio_coding/codecs/builtin_audio_decoder_factory.h
+++ b/webrtc/modules/audio_coding/codecs/builtin_audio_decoder_factory_internal.h
@@ -8,20 +8,17 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#ifndef WEBRTC_MODULES_AUDIO_CODING_CODECS_BUILTIN_AUDIO_DECODER_FACTORY_H_
-#define WEBRTC_MODULES_AUDIO_CODING_CODECS_BUILTIN_AUDIO_DECODER_FACTORY_H_
-
-#include <memory>
+#ifndef WEBRTC_MODULES_AUDIO_CODING_CODECS_BUILTIN_AUDIO_DECODER_FACTORY_INTERNAL_H_
+#define WEBRTC_MODULES_AUDIO_CODING_CODECS_BUILTIN_AUDIO_DECODER_FACTORY_INTERNAL_H_
 
+#include "webrtc/api/audio_codecs/audio_decoder_factory.h"
 #include "webrtc/base/scoped_ref_ptr.h"
-#include "webrtc/modules/audio_coding/codecs/audio_decoder_factory.h"
 
 namespace webrtc {
 
-// Creates a new factory that can create the built-in types of audio decoders.
-// NOTE: This function is still under development and may change without notice.
-rtc::scoped_refptr<AudioDecoderFactory> CreateBuiltinAudioDecoderFactory();
+rtc::scoped_refptr<AudioDecoderFactory>
+CreateBuiltinAudioDecoderFactoryInternal();
 
 }  // namespace webrtc
 
-#endif  // WEBRTC_MODULES_AUDIO_CODING_CODECS_BUILTIN_AUDIO_DECODER_FACTORY_H_
+#endif  // WEBRTC_MODULES_AUDIO_CODING_CODECS_BUILTIN_AUDIO_DECODER_FACTORY_INTERNAL_H_