Enable experiment WebRTC-SendPacketsOnWorkerThread in pc_full_stack_test

This is a follow up to https://webrtc-review.googlesource.com/c/src/+/278980 to actually enable the experiment in some tests.

Bug: webrtc:14502
Change-Id: I166f984bcb94527adc6ebb9169b66abf0f105d76
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/279140
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Commit-Queue: Per Kjellander <perkj@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#38407}
diff --git a/video/pc_full_stack_tests.cc b/video/pc_full_stack_tests.cc
index 715f399..d1a1ff6 100644
--- a/video/pc_full_stack_tests.cc
+++ b/video/pc_full_stack_tests.cc
@@ -97,10 +97,8 @@
           // Use the network thread as worker thread.
           // Use the worker thread for sending packets.
           // https://bugs.chromium.org/p/webrtc/issues/detail?id=14502
-          {// TODO(webrtc:14502): Enable field trial soon but let it first run a
-           // couple of times to get a baseline..
-           // .use_network_thread_as_worker_thread = true,
-           // .field_trials = "WebRTC-SendPacketsOnWorkerThread/Enabled/",
+          {.use_network_thread_as_worker_thread = true,
+           .field_trials = "WebRTC-SendPacketsOnWorkerThread/Enabled/",
            .test_case_name_postfix = "_ReducedThreads"}};
 }