Move AudioDecoder and related stuff to the api/ directory

webrtc/api/audio_codecs/audio_decoder.h

Index: webrtc/api/audio_codecs/audio_decoder.h
diff --git a/webrtc/modules/audio_coding/codecs/audio_decoder.h b/webrtc/api/audio_codecs/audio_decoder.h
similarity index 95%
copy from webrtc/modules/audio_coding/codecs/audio_decoder.h
copy to webrtc/api/audio_codecs/audio_decoder.h
index 8468da20f2b74669fabcd3607cbf8f47ef35c715..dab7d3b2731c68d075ec5017ad3a6bfce00d9739 100644
--- a/webrtc/modules/audio_coding/codecs/audio_decoder.h
+++ b/webrtc/api/audio_codecs/audio_decoder.h
@@ -8,8 +8,8 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#ifndef WEBRTC_MODULES_AUDIO_CODING_CODECS_AUDIO_DECODER_H_
-#define WEBRTC_MODULES_AUDIO_CODING_CODECS_AUDIO_DECODER_H_
+#ifndef WEBRTC_API_AUDIO_CODECS_AUDIO_DECODER_H_
+#define WEBRTC_API_AUDIO_CODECS_AUDIO_DECODER_H_
 
 #include <memory>
 #include <vector>
@@ -22,13 +22,11 @@
 
 namespace webrtc {
 
-// This is the interface class for decoders in NetEQ. Each codec type will have
-// and implementation of this class.
 class AudioDecoder {
  public:
   enum SpeechType {
     kSpeech = 1,
-    kComfortNoise = 2
+    kComfortNoise = 2,
   };
 
   // Used by PacketDuration below. Save the value -1 for errors.
@@ -176,4 +174,4 @@ class AudioDecoder {
 };
 
 }  // namespace webrtc
-#endif  // WEBRTC_MODULES_AUDIO_CODING_CODECS_AUDIO_DECODER_H_
+#endif  // WEBRTC_API_AUDIO_CODECS_AUDIO_DECODER_H_