Move MediaTransportInterface out of the libjingle_peerconnection_api target

And move related files into api/transport/ and api/transport/media/.
The moved files are unchanged, except that
congestion_control_interface.h and datagram_transport_interface.h
no longer include media_transport_interface.h, instead, they forward
declare the few MediaTransport* types they reference.

Bug: webrtc:8733
Change-Id: I4f4000d0d111f10d15a54c99af27ec26c46ae652
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/152482
Commit-Queue: Niels Moller <nisse@webrtc.org>
Reviewed-by: Bjorn Mellem <mellem@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29178}
diff --git a/call/video_receive_stream.h b/call/video_receive_stream.h
index 3869c81..b1d45ac 100644
--- a/call/video_receive_stream.h
+++ b/call/video_receive_stream.h
@@ -20,10 +20,10 @@
 #include "api/call/transport.h"
 #include "api/crypto/crypto_options.h"
 #include "api/crypto/frame_decryptor_interface.h"
-#include "api/media_transport_config.h"
-#include "api/media_transport_interface.h"
 #include "api/rtp_headers.h"
 #include "api/rtp_parameters.h"
+#include "api/transport/media/media_transport_config.h"
+#include "api/transport/media/media_transport_interface.h"
 #include "api/transport/rtp/rtp_source.h"
 #include "api/video/video_content_type.h"
 #include "api/video/video_frame.h"