ChromeOS NetworkScreenHandler should not call CheckAndResolveLocale on UI thread.

chrome/browser/chromeos/base/locale_util.h

Index: chrome/browser/chromeos/base/locale_util.h
diff --git a/chrome/browser/chromeos/base/locale_util.h b/chrome/browser/chromeos/base/locale_util.h
index cf252a470c622c660f63d45890cee5bf7025ecb8..751378db499bbba4b916cf57df7821634c424017 100644
--- a/chrome/browser/chromeos/base/locale_util.h
+++ b/chrome/browser/chromeos/base/locale_util.h
@@ -21,14 +21,24 @@ class Callback;
 namespace chromeos {
 namespace locale_util {
 
+struct LanguageSwitchResult {
+  LanguageSwitchResult(const std::string& requested_locale,
+                       const std::string& loaded_locale,
+                       bool success);
+
+  std::string requested_locale;
+  std::string loaded_locale;
+  bool success;
+};
+
 // This callback is called on UI thread, when ReloadLocaleResources() is
 // completed on BlockingPool.
-// Arguments:
+// |result| contains:
 //   locale - (copy of) locale argument to SwitchLanguage(). Expected locale.
 //   loaded_locale - actual locale name loaded.
 //   success - if locale load succeeded.
 // (const std::string* locale, const std::string* loaded_locale, bool success)
-typedef base::Callback<void(const std::string&, const std::string&, bool)>
+typedef base::Callback<void(const LanguageSwitchResult& result)>
     SwitchLanguageCallback;
 
 // This function updates input methods only if requested. In general, you want
@@ -41,7 +51,7 @@ typedef base::Callback<void(const std::string&, const std::string&, bool)>
 void SwitchLanguage(const std::string& locale,
                     const bool enable_locale_keyboard_layouts,
                     const bool login_layouts_only,
-                    scoped_ptr<SwitchLanguageCallback> callback);
+                    const SwitchLanguageCallback& callback);
 
 }  // namespace locale_util
 }  // namespace chromeos