Revert "[Local Network Access] Rename chrome browsertest."

This reverts commit eccd2c1.

Reason for revert: The spec has been renamed back to Private Network Access WICG/private-network-access#106

Original change's description:
> [Local Network Access] Rename chrome browsertest.
>
> Bug: chromium:1418287
> Change-Id: I128095f446ca9b56a6fafc7a90eb54d009241eca
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4324684
> Reviewed-by: Matt Menke <mmenke@chromium.org>
> Commit-Queue: Titouan Rigoudy <titouan@chromium.org>
> Auto-Submit: Titouan Rigoudy <titouan@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1115759}

Bug: chromium:1418287
Change-Id: Ic1d692f2e00bcc39c171336a96f61238e4c7dd5a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4693905
Reviewed-by: Titouan Rigoudy <titouan@chromium.org>
Commit-Queue: Jonathan Hao <phao@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1172271}

chrome/browser/net/OWNERS

@@ -2,4 +2,4 @@ file://net/OWNERS
 
 per-file android_network_service_browsertest.cc=wfh@chromium.org
 per-file network_quality*=file://net/nqe/OWNERS
-per-file local_network_access_browsertest*=titouan@chromium.org
+per-file private_network_access_browsertest*=titouan@chromium.org