WebRTC-DeprecateGlobalFieldTrialString/Enabled/ - part 8/inf

Convert p2p/.
This completes work started in https://webrtc-review.googlesource.com/c/src/+/255602

Bug: webrtc:10335
Change-Id: I39f70890be0599c8ef46ff7982d2a229e10e67ff
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/255827
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Jonas Oreland <jonaso@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#36231}
diff --git a/pc/jsep_transport_controller.cc b/pc/jsep_transport_controller.cc
index 6c69130..727a30a 100644
--- a/pc/jsep_transport_controller.cc
+++ b/pc/jsep_transport_controller.cc
@@ -400,6 +400,7 @@
   init.set_port_allocator(port_allocator_);
   init.set_async_dns_resolver_factory(async_dns_resolver_factory_);
   init.set_event_log(config_.event_log);
+  init.set_field_trials(config_.field_trials);
   return config_.ice_transport_factory->CreateIceTransport(
       transport_name, component, std::move(init));
 }