Move AudioDecoder and related stuff to the api/ directory

webrtc/modules/audio_coding/codecs/builtin_audio_decoder_factory.h

Index: webrtc/modules/audio_coding/codecs/builtin_audio_decoder_factory.h
diff --git a/webrtc/modules/audio_coding/codecs/builtin_audio_decoder_factory.h b/webrtc/modules/audio_coding/codecs/builtin_audio_decoder_factory.h
index 7bc35863cb03483da21d2e7f254ce8107bae5c5f..7e6407adeda79ad891c2e8b18a61f89ec0ccc077 100644
--- a/webrtc/modules/audio_coding/codecs/builtin_audio_decoder_factory.h
+++ b/webrtc/modules/audio_coding/codecs/builtin_audio_decoder_factory.h
@@ -8,20 +8,13 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
+// This file is for backwards compatibility only! Use
+// webrtc/api/audio_codecs/builtin_audio_decoder_factory.h instead!
+// TODO(kwiberg): Remove it.
+
 #ifndef WEBRTC_MODULES_AUDIO_CODING_CODECS_BUILTIN_AUDIO_DECODER_FACTORY_H_
 #define WEBRTC_MODULES_AUDIO_CODING_CODECS_BUILTIN_AUDIO_DECODER_FACTORY_H_
 
-#include <memory>
-
-#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();
-
-}  // namespace webrtc
+#include "webrtc/api/audio_codecs/builtin_audio_decoder_factory.h"
 
 #endif  // WEBRTC_MODULES_AUDIO_CODING_CODECS_BUILTIN_AUDIO_DECODER_FACTORY_H_