Delete old placeholders for moved api/ header files

The header files

  api/congestion_control_interface.h
  api/data_channel_transport_interface.h
  api/datagram_transport_interface.h
  api/media_transport_config.h
  api/media_transport_interface.h

have been moved into the api/transport/ and api/transport/media
subdirectories.

Bug: webrtc:8733
Change-Id: I98752c4d1306b54559bafa71712b105932c08834
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/153522
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29357}
diff --git a/api/BUILD.gn b/api/BUILD.gn
index 8366025..27fb45e 100644
--- a/api/BUILD.gn
+++ b/api/BUILD.gn
@@ -123,12 +123,9 @@
   sources = [
     "candidate.cc",
     "candidate.h",
-    "congestion_control_interface.h",
     "crypto_params.h",
     "data_channel_interface.cc",
     "data_channel_interface.h",
-    "data_channel_transport_interface.h",
-    "datagram_transport_interface.h",
     "dtls_transport_interface.cc",
     "dtls_transport_interface.h",
     "dtmf_sender_interface.h",
@@ -140,8 +137,6 @@
     "jsep_session_description.h",
     "media_stream_proxy.h",
     "media_stream_track_proxy.h",
-    "media_transport_config.h",
-    "media_transport_interface.h",
     "peer_connection_factory_proxy.h",
     "peer_connection_interface.cc",
     "peer_connection_interface.h",
diff --git a/api/congestion_control_interface.h b/api/congestion_control_interface.h
deleted file mode 100644
index 3666022..0000000
--- a/api/congestion_control_interface.h
+++ /dev/null
@@ -1,17 +0,0 @@
-/* Copyright 2018 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#ifndef API_CONGESTION_CONTROL_INTERFACE_H_
-#define API_CONGESTION_CONTROL_INTERFACE_H_
-
-// TODO(bugs.webrtc.org/8733): Delete once users are updated for the new
-// location.
-#include "api/transport/congestion_control_interface.h"
-
-#endif  // API_CONGESTION_CONTROL_INTERFACE_H_
diff --git a/api/data_channel_transport_interface.h b/api/data_channel_transport_interface.h
deleted file mode 100644
index dcb693c..0000000
--- a/api/data_channel_transport_interface.h
+++ /dev/null
@@ -1,17 +0,0 @@
-/* Copyright 2019 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#ifndef API_DATA_CHANNEL_TRANSPORT_INTERFACE_H_
-#define API_DATA_CHANNEL_TRANSPORT_INTERFACE_H_
-
-// TODO(bugs.webrtc.org/8733): Delete once users are updated for the new
-// location.
-#include "api/transport/data_channel_transport_interface.h"
-
-#endif  // API_DATA_CHANNEL_TRANSPORT_INTERFACE_H_
diff --git a/api/datagram_transport_interface.h b/api/datagram_transport_interface.h
deleted file mode 100644
index f36f5b3..0000000
--- a/api/datagram_transport_interface.h
+++ /dev/null
@@ -1,17 +0,0 @@
-/* Copyright 2018 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#ifndef API_DATAGRAM_TRANSPORT_INTERFACE_H_
-#define API_DATAGRAM_TRANSPORT_INTERFACE_H_
-
-// TODO(bugs.webrtc.org/8733): Delete once users are updated for the new
-// location.
-#include "api/transport/datagram_transport_interface.h"
-
-#endif  // API_DATAGRAM_TRANSPORT_INTERFACE_H_
diff --git a/api/media_transport_config.h b/api/media_transport_config.h
deleted file mode 100644
index c74f38d..0000000
--- a/api/media_transport_config.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/* Copyright 2018 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-#ifndef API_MEDIA_TRANSPORT_CONFIG_H_
-#define API_MEDIA_TRANSPORT_CONFIG_H_
-
-// TODO(bugs.webrtc.org/8733): Delete once users are updated for the new
-// location.
-#include "api/transport/media/media_transport_config.h"
-
-#endif  // API_MEDIA_TRANSPORT_CONFIG_H_
diff --git a/api/media_transport_interface.h b/api/media_transport_interface.h
deleted file mode 100644
index 867871b..0000000
--- a/api/media_transport_interface.h
+++ /dev/null
@@ -1,17 +0,0 @@
-/* Copyright 2018 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#ifndef API_MEDIA_TRANSPORT_INTERFACE_H_
-#define API_MEDIA_TRANSPORT_INTERFACE_H_
-
-// TODO(bugs.webrtc.org/8733): Delete once users are updated for the new
-// location.
-#include "api/transport/media/media_transport_interface.h"
-
-#endif  // API_MEDIA_TRANSPORT_INTERFACE_H_
diff --git a/pc/composite_data_channel_transport.h b/pc/composite_data_channel_transport.h
index b2a40fd..97633cb 100644
--- a/pc/composite_data_channel_transport.h
+++ b/pc/composite_data_channel_transport.h
@@ -13,7 +13,7 @@
 
 #include <vector>
 
-#include "api/data_channel_transport_interface.h"
+#include "api/transport/data_channel_transport_interface.h"
 #include "rtc_base/critical_section.h"
 
 namespace webrtc {
diff --git a/pc/sctp_data_channel_transport.h b/pc/sctp_data_channel_transport.h
index 2d54be9..281c30e 100644
--- a/pc/sctp_data_channel_transport.h
+++ b/pc/sctp_data_channel_transport.h
@@ -11,7 +11,7 @@
 #ifndef PC_SCTP_DATA_CHANNEL_TRANSPORT_H_
 #define PC_SCTP_DATA_CHANNEL_TRANSPORT_H_
 
-#include "api/data_channel_transport_interface.h"
+#include "api/transport/data_channel_transport_interface.h"
 #include "media/sctp/sctp_transport_internal.h"
 #include "rtc_base/third_party/sigslot/sigslot.h"
 
diff --git a/pc/sctp_utils.h b/pc/sctp_utils.h
index 6d41eb2..339ef21 100644
--- a/pc/sctp_utils.h
+++ b/pc/sctp_utils.h
@@ -14,7 +14,7 @@
 #include <string>
 
 #include "api/data_channel_interface.h"
-#include "api/data_channel_transport_interface.h"
+#include "api/transport/data_channel_transport_interface.h"
 #include "media/base/media_channel.h"
 
 namespace rtc {