Move AudioDecoder and related stuff to the api/ directory

webrtc/api/peerconnectioninterface.h

Index: webrtc/api/peerconnectioninterface.h
diff --git a/webrtc/api/peerconnectioninterface.h b/webrtc/api/peerconnectioninterface.h
index 0280c18dbdbf7f4c28efa6cff8fd49f60bee17b0..b19ef453df61dabf070260703258b5a2e21d0114 100644
--- a/webrtc/api/peerconnectioninterface.h
+++ b/webrtc/api/peerconnectioninterface.h
@@ -57,13 +57,14 @@
 #include <utility>
 #include <vector>
 
+#include "webrtc/api/audio_codec/audio_decoder_factory.h"

[the sun, 2017/02/02 21:02:29]

Here's another bike shed: audio_codecs feels like a better name, since the
reason we have a subfolder is so we can put all the codecs (plural) in one
place.

[kwiberg-webrtc, 2017/02/03 09:50:11]

OK, fine. As long as I don't have to do the renaming dance a fourth time...

 #include "webrtc/api/datachannelinterface.h"
 #include "webrtc/api/dtmfsenderinterface.h"
 #include "webrtc/api/jsep.h"
 #include "webrtc/api/mediastreaminterface.h"
-#include "webrtc/api/stats/rtcstatscollectorcallback.h"
 #include "webrtc/api/rtpreceiverinterface.h"
 #include "webrtc/api/rtpsenderinterface.h"
+#include "webrtc/api/stats/rtcstatscollectorcallback.h"
 #include "webrtc/api/statstypes.h"
 #include "webrtc/api/umametrics.h"
 #include "webrtc/base/fileutils.h"
@@ -73,7 +74,6 @@
 #include "webrtc/base/socketaddress.h"
 #include "webrtc/base/sslstreamadapter.h"
 #include "webrtc/media/base/mediachannel.h"
-#include "webrtc/modules/audio_coding/codecs/audio_decoder_factory.h"
 #include "webrtc/p2p/base/portallocator.h"
 
 namespace rtc {