Move injection of PacketSocketFactory from PC to PCF

Injection via PeerConnectionDependecies was broken, in not accepting
ownership of the injected object.

Bug: webrtc:7447, webrtc:14204
Change-Id: Ic53f05d51928b006fc1e46d502633d88471eb518
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/266140
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#37270}
diff --git a/api/peer_connection_interface.h b/api/peer_connection_interface.h
index e5bbd9c..bd2f46f 100644
--- a/api/peer_connection_interface.h
+++ b/api/peer_connection_interface.h
@@ -1379,10 +1379,9 @@
   PeerConnectionObserver* observer = nullptr;
   // Optional dependencies
   // TODO(bugs.webrtc.org/7447): remove port allocator once downstream is
-  // updated. For now, you can only set one of allocator and
-  // packet_socket_factory, not both.
+  // updated. The recommended way to inject networking components is to pass a
+  // PacketSocketFactory when creating the PeerConnectionFactory.
   std::unique_ptr<cricket::PortAllocator> allocator;
-  std::unique_ptr<rtc::PacketSocketFactory> packet_socket_factory;
   // Factory for creating resolvers that look up hostnames in DNS
   std::unique_ptr<webrtc::AsyncDnsResolverFactoryInterface>
       async_dns_resolver_factory;
@@ -1422,6 +1421,7 @@
   rtc::Thread* worker_thread = nullptr;
   rtc::Thread* signaling_thread = nullptr;
   rtc::SocketFactory* socket_factory = nullptr;
+  std::unique_ptr<rtc::PacketSocketFactory> packet_socket_factory;
   std::unique_ptr<TaskQueueFactory> task_queue_factory;
   std::unique_ptr<cricket::MediaEngineInterface> media_engine;
   std::unique_ptr<CallFactoryInterface> call_factory;