ChromeOS NetworkScreenHandler should not call CheckAndResolveLocale on UI thread.

chrome/browser/chromeos/chrome_browser_main_chromeos.cc

Index: chrome/browser/chromeos/chrome_browser_main_chromeos.cc
diff --git a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
index da1c2b50f824061fe8431b3c1b5a96837cdfd4df..f39d7970245d711223b3e2aeb37726b1ce98ae60 100644
--- a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
+++ b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
@@ -452,9 +452,7 @@ class GuestLanguageSetCallbackData {
 
   // Must match SwitchLanguageCallback type.
   static void Callback(const scoped_ptr<GuestLanguageSetCallbackData>& self,
-                       const std::string& locale,
-                       const std::string& loaded_locale,
-                       bool success);
+                       scoped_ptr<locale_util::LanguageSwitchResult> result);
 
   Profile* profile;
 };
@@ -462,9 +460,7 @@ class GuestLanguageSetCallbackData {
 // static
 void GuestLanguageSetCallbackData::Callback(
     const scoped_ptr<GuestLanguageSetCallbackData>& self,
-    const std::string& locale,
-    const std::string& loaded_locale,
-    bool success) {
+    scoped_ptr<locale_util::LanguageSwitchResult> result) {
   input_method::InputMethodManager* manager =
       input_method::InputMethodManager::Get();
   scoped_refptr<input_method::InputMethodManager::State> ime_state =
@@ -480,7 +476,7 @@ void GuestLanguageSetCallbackData::Callback(
   // Second, enable locale based input methods.
   const std::string locale_default_input_method =
       manager->GetInputMethodUtil()->GetLanguageDefaultInputMethodId(
-          loaded_locale);
+          result->loaded_locale);
   if (!locale_default_input_method.empty()) {
     PrefService* user_prefs = self->profile->GetPrefs();
     user_prefs->SetString(prefs::kLanguagePreviousInputMethod,