Move network emulation framework under test/network

Bug: webrtc:10138
Change-Id: I654bc124866241ceca65462937e2fad6294cc62b
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/144622
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Reviewed-by: Sebastian Jansson <srte@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28492}
diff --git a/BUILD.gn b/BUILD.gn
index 28ad562..23ce0f0 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -497,7 +497,7 @@
       "rtc_base/task_utils:to_queued_task_unittests",
       "sdk:sdk_tests",
       "test:test_main",
-      "test/scenario/network:network_emulation_unittests",
+      "test/network:network_emulation_unittests",
     ]
 
     if (rtc_enable_protobuf) {