Default to current UI locale when recommended locales are invalid

chrome/browser/ui/webui/chromeos/login/l10n_util.cc

Index: chrome/browser/ui/webui/chromeos/login/l10n_util.cc
diff --git a/chrome/browser/ui/webui/chromeos/login/l10n_util.cc b/chrome/browser/ui/webui/chromeos/login/l10n_util.cc
index aa8d38bb45148ad52dc6a7de5cb05fa9d4fbc2bc..3bb24e8cf092301cd55e0ffa7ac8f4987ac3c45d 100644
--- a/chrome/browser/ui/webui/chromeos/login/l10n_util.cc
+++ b/chrome/browser/ui/webui/chromeos/login/l10n_util.cc
@@ -370,6 +370,29 @@ scoped_ptr<base::ListValue> GetUILanguageList(
   return languages_list.Pass();
 }
 
+std::string FindMostRelevantLocale(
+    const std::vector<std::string>* most_relevant_language_codes,
+    const base::ListValue& available_locales,
+    const std::string& fallback_locale) {
+  if (!most_relevant_language_codes)
+    return fallback_locale;
+
+  for (std::vector<std::string>::const_iterator most_relevant_it =
+          most_relevant_language_codes->begin();
+       most_relevant_it != most_relevant_language_codes->end();
+       ++most_relevant_it) {
+    base::StringValue most_relevant_locale(*most_relevant_it);
+    for (base::ListValue::const_iterator available_it =
+             available_locales.begin();
+         available_it != available_locales.end(); ++available_it) {
+      if (most_relevant_locale.Equals(*available_it))
+        return *most_relevant_it;
+    }
+  }
+
+  return fallback_locale;
+}
+
 scoped_ptr<base::ListValue> GetAcceptLanguageList() {
   // Collect the language codes from the supported accept-languages.
   const std::string app_locale = g_browser_process->GetApplicationLocale();