Added dependencies to mock transport controller send.

Added dependencies used by MockRtpTransportControllerSend to its header
file. The mocked interface can't be used properly without those.

This prepares for later CLs utilizing the mock.

Bug: None
Change-Id: I5f8ca04032ad09810240f7c034cc628d700dbedb
Reviewed-on: https://webrtc-review.googlesource.com/56181
Reviewed-by: Niels Moller <nisse@webrtc.org>
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22154}

call/BUILD.gn

@@ -313,6 +313,10 @@ if (rtc_include_tests) {
     ]
     deps = [
       ":rtp_interfaces",
+      "../modules/congestion_controller",
+      "../modules/pacing",
+      "../rtc_base:rate_limiter",
+      "../rtc_base:rtc_base",
       "../test:test_support",
     ]
   }

call/test/mock_rtp_transport_controller_send.h

@@ -13,7 +13,13 @@
 
 #include <string>
 
+#include "call/bitrate_constraints.h"
 #include "call/rtp_transport_controller_send_interface.h"
+#include "modules/congestion_controller/include/network_changed_observer.h"
+#include "modules/pacing/packet_router.h"
+#include "rtc_base/networkroute.h"
+#include "rtc_base/rate_limiter.h"
+#include "rtc_base/socket.h"
 #include "test/gmock.h"
 
 namespace webrtc {