Move AudioDecoder and related stuff to the api/ directory

webrtc/modules/audio_coding/neteq/timestamp_scaler_unittest.cc

Index: webrtc/modules/audio_coding/neteq/timestamp_scaler_unittest.cc
diff --git a/webrtc/modules/audio_coding/neteq/timestamp_scaler_unittest.cc b/webrtc/modules/audio_coding/neteq/timestamp_scaler_unittest.cc
index 41c33426edfee7e7dc7e3f35037afdfd96e804bd..13c45547aeaeef28ed32964453069dd736b67c3c 100644
--- a/webrtc/modules/audio_coding/neteq/timestamp_scaler_unittest.cc
+++ b/webrtc/modules/audio_coding/neteq/timestamp_scaler_unittest.cc
@@ -8,11 +8,10 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#include "webrtc/modules/audio_coding/neteq/timestamp_scaler.h"
-
-#include "webrtc/modules/audio_coding/codecs/builtin_audio_decoder_factory.h"
+#include "webrtc/api/audio_codecs/builtin_audio_decoder_factory.h"
 #include "webrtc/modules/audio_coding/neteq/mock/mock_decoder_database.h"
 #include "webrtc/modules/audio_coding/neteq/packet.h"
+#include "webrtc/modules/audio_coding/neteq/timestamp_scaler.h"
 #include "webrtc/test/gmock.h"
 #include "webrtc/test/gtest.h"