Fix race / crash in OnNetworkRouteChanged().

webrtc/modules/BUILD.gn

Index: webrtc/modules/BUILD.gn
diff --git a/webrtc/modules/BUILD.gn b/webrtc/modules/BUILD.gn
index 5514bf73ecb2d8619b9c270d0d39eb5cc95aa58b..bd3c0cd717d65f79c9cf8ea11a7b75331dcb6f65 100644
--- a/webrtc/modules/BUILD.gn
+++ b/webrtc/modules/BUILD.gn
@@ -376,6 +376,7 @@ if (rtc_include_tests) {
       "congestion_controller/delay_based_bwe_unittest_helper.h",
       "congestion_controller/probe_bitrate_estimator_unittest.cc",
       "congestion_controller/probe_controller_unittest.cc",
+      "congestion_controller/transport_feedback_adapter_unittest.cc",
       "media_file/media_file_unittest.cc",
       "module_common_types_unittest.cc",
       "pacing/bitrate_prober_unittest.cc",
@@ -395,7 +396,6 @@ if (rtc_include_tests) {
       "remote_bitrate_estimator/test/bwe_unittest.cc",
       "remote_bitrate_estimator/test/estimators/nada_unittest.cc",
       "remote_bitrate_estimator/test/metric_recorder_unittest.cc",
-      "remote_bitrate_estimator/transport_feedback_adapter_unittest.cc",
       "rtp_rtcp/source/byte_io_unittest.cc",
       "rtp_rtcp/source/fec_receiver_unittest.cc",
       "rtp_rtcp/source/fec_test_helper.cc",