Move chrome/browser/ash/login/quick_unlock/ to namespace ash

The migration of chromeos/browser/chromeos/login/quick_unlock/ was
finished in https://crrev.com/c/2721915. This CL changes the namespace
from chromeos to ash. Compatibility code is added until the Chrome OS
source code migration is finished.

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

Bug: 1164001
Change-Id: I6b5c7315a09cf86d1134b7af1eb15e1d0d92ee7d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3017877
Commit-Queue: Henrique Ferreiro <[email protected]>
Reviewed-by: Hidehiko Abe <[email protected]>
Owners-Override: Hidehiko Abe <[email protected]>
Cr-Commit-Position: refs/heads/master@{#902927}
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index 9415600..69791f0 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -1267,13 +1267,13 @@
   chromeos::NetworkMetadataStore::RegisterPrefs(registry);
   ash::ReleaseNotesStorage::RegisterProfilePrefs(registry);
   chromeos::HelpAppNotificationController::RegisterProfilePrefs(registry);
-  chromeos::quick_unlock::FingerprintStorage::RegisterProfilePrefs(registry);
-  chromeos::quick_unlock::PinStoragePrefs::RegisterProfilePrefs(registry);
+  ash::quick_unlock::FingerprintStorage::RegisterProfilePrefs(registry);
+  ash::quick_unlock::PinStoragePrefs::RegisterProfilePrefs(registry);
   chromeos::Preferences::RegisterProfilePrefs(registry);
   chromeos::EnterprisePrintersProvider::RegisterProfilePrefs(registry);
   ash::parent_access::ParentAccessService::RegisterProfilePrefs(registry);
   chromeos::quick_answers::prefs::RegisterProfilePrefs(registry);
-  chromeos::quick_unlock::RegisterProfilePrefs(registry);
+  ash::quick_unlock::RegisterProfilePrefs(registry);
   chromeos::RegisterSamlProfilePrefs(registry);
   ash::ScreenTimeController::RegisterProfilePrefs(registry);
   SecondaryAccountConsentLogger::RegisterPrefs(registry);