Allows injection of network controller factory into peer connection factory.

Bug: webrtc:9155
Change-Id: I0a17024042f154297aba20f5d2dc766feb27f3f7
Reviewed-on: https://webrtc-review.googlesource.com/73123
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Reviewed-by: Taylor Brandstetter <deadbeef@webrtc.org>
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23313}
diff --git a/api/BUILD.gn b/api/BUILD.gn
index effdb5d..f8b282f 100644
--- a/api/BUILD.gn
+++ b/api/BUILD.gn
@@ -108,6 +108,7 @@
     "audio:audio_mixer_api",
     "audio_codecs:audio_codecs_api",
     "transport:bitrate_settings",
+    "transport:network_control",
     "video:video_frame",
 
     # Basically, don't add stuff here. You might break sensitive downstream