Change namespace chromeos => ash for //c/b/ash/apps

Code in //chrome/browser/ash/apps is a part of the ash-chrome, so
namespace is changed to ash from chromeos.

Change-Id: Ib21147594e71cebb7cc91b23f14a4415002f14ab
Bug: 1164001
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2739180
Reviewed-by: Hidehiko Abe <[email protected]>
Owners-Override: Hidehiko Abe <[email protected]>
Commit-Queue: Yeunjoo Choi <[email protected]>
Cr-Commit-Position: refs/heads/master@{#860714}
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index 63269424..46b5653 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -1035,7 +1035,7 @@
   ArcAppListPrefs::RegisterProfilePrefs(registry);
   certificate_manager::CertificatesHandler::RegisterProfilePrefs(registry);
   ash::AccountManager::RegisterPrefs(registry);
-  chromeos::ApkWebAppService::RegisterProfilePrefs(registry);
+  ash::ApkWebAppService::RegisterProfilePrefs(registry);
   chromeos::app_time::AppActivityRegistry::RegisterProfilePrefs(registry);
   chromeos::app_time::AppTimeController::RegisterProfilePrefs(registry);
   chromeos::assistant::prefs::RegisterProfilePrefs(registry);