Set AppLocale global preference on network screen.

There is no device owner during OOBE, so owner settings are not saved, but
language setting should be stored.

BUG=chrome-os-partner:27284
TEST=none

Review URL: https://codereview.chromium.org/299443018

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272666 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/ui/webui/chromeos/login/network_screen_handler.cc

@@ -312,6 +312,12 @@ void NetworkScreenHandler::OnLanguageChangedCallback(
 
   self->ReloadLocalizedContent();
 
+  // We still do not have device owner, so owner settings are not applied.
+  // But Guest session can be started before owner is created, so we need to
+  // save locale settings directly here.
+  g_browser_process->local_state()->SetString(prefs::kApplicationLocale,
+                                              self->selected_language_code_);
+
   AccessibilityManager::Get()->OnLocaleChanged();
 }