Move //{chromeos => ash}/components/proximity_auth

This CL is part of the Chrome OS source code directory migration:
https://docs.google.com/document/d/1g-98HpzA8XcoGBWUv1gQNr4rbnD5yfvbtYZyPDDbkaE.

Change-Id: I396293a976a5182adfad5375f22e4fb109739789
Bug: 1164001
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3308311
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Owners-Override: Hidehiko Abe <hidehiko@chromium.org>
Commit-Queue: Yeunjoo Choi <ychoi@igalia.com>
Cr-Commit-Position: refs/heads/main@{#949387}

diff --git a/BUILD.gn b/BUILD.gn
index a4cf194..2a1fb96a 100644
--- a/BUILD.gn
+++ b/BUILD.gn

@@ -468,12 +468,12 @@
   if (is_chromeos_ash) {
     deps += [
       "//ash:ash_unittests",
+      "//ash/components/proximity_auth:proximity_auth_unittests",
       "//ash/keyboard/ui:keyboard_unittests",
       "//ash/webui:ash_webui_unittests",
       "//chrome/browser/metrics/perf:profile_provider_unittest",
       "//chrome/test:usage_time_limit_unittests",
       "//chromeos/components:chromeos_components_unittests",
-      "//chromeos/components/proximity_auth:proximity_auth_unittests",
       "//components/exo/wayland:wayland_client_compatibility_tests",
       "//components/session_manager/core",
       "//third_party/shell-encryption:shell_encryption_unittests",