Move webrtc/audio_*.h to webrtc/api/call

BUG=webrtc:5878
NOTRY=True

Review-Url: https://codereview.webrtc.org/2059703002
Cr-Original-Commit-Position: refs/heads/master@{#13996}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: a69d973267d4a10cbb51b9c47023ba4a3c854167
diff --git a/api/remoteaudiosource.h b/api/remoteaudiosource.h
index 4cc68f8..a67b895 100644
--- a/api/remoteaudiosource.h
+++ b/api/remoteaudiosource.h
@@ -14,8 +14,8 @@
 #include <list>
 #include <string>
 
+#include "webrtc/api/call/audio_sink.h"
 #include "webrtc/api/notifier.h"
-#include "webrtc/audio_sink.h"
 #include "webrtc/base/criticalsection.h"
 #include "webrtc/pc/channel.h"