Merge "Fix threading issue for mDefaultNetworkRequests" into main am: a5a549bfd8 am: cd7d7b9c64

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3251251

Change-Id: Iacdb06d1b70ae91ca658f495f3c72bba2ad49d6d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>