Revert of ChromeOS NetworkScreenHandler should not call CheckAndResolveLocale on UI thread.

chrome/browser/chromeos/login/wizard_controller_browsertest.cc

Index: chrome/browser/chromeos/login/wizard_controller_browsertest.cc
diff --git a/chrome/browser/chromeos/login/wizard_controller_browsertest.cc b/chrome/browser/chromeos/login/wizard_controller_browsertest.cc
index 40a256a6a2079dde8d403ed757004354d647008a..7330dd0745b7a1ccd1bfcb9fe17f98f79fcb0596 100644
--- a/chrome/browser/chromeos/login/wizard_controller_browsertest.cc
+++ b/chrome/browser/chromeos/login/wizard_controller_browsertest.cc
@@ -120,15 +120,21 @@
 };
 
 struct SwitchLanguageTestData {
-  SwitchLanguageTestData() : result("", "", false), done(false) {}
-
-  locale_util::LanguageSwitchResult result;
+  SwitchLanguageTestData() : success(false), done(false) {}
+
+  std::string requested_locale;
+  std::string loaded_locale;
+  bool success;
   bool done;
 };
 
 void OnLocaleSwitched(SwitchLanguageTestData* self,
-                      const locale_util::LanguageSwitchResult& result) {
-  self->result = result;
+                      const std::string& locale,
+                      const std::string& loaded_locale,
+                      const bool success) {
+  self->requested_locale = locale;
+  self->loaded_locale = loaded_locale;
+  self->success = success;
   self->done = true;
 }
 
@@ -136,17 +142,18 @@
                                   const std::string& expected_locale,
                                   const bool expect_success) {
   SwitchLanguageTestData data;
-  locale_util::SwitchLanguageCallback callback(
-      base::Bind(&OnLocaleSwitched, base::Unretained(&data)));
-  locale_util::SwitchLanguage(locale, true, false, callback);
+  scoped_ptr<locale_util::SwitchLanguageCallback> callback(
+      new locale_util::SwitchLanguageCallback(
+          base::Bind(&OnLocaleSwitched, base::Unretained(&data))));
+  locale_util::SwitchLanguage(locale, true, false, callback.Pass());
 
   // Token writing moves control to BlockingPool and back.
   content::RunAllBlockingPoolTasksUntilIdle();
 
   EXPECT_EQ(data.done, true);
-  EXPECT_EQ(data.result.requested_locale, locale);
-  EXPECT_EQ(data.result.loaded_locale, expected_locale);
-  EXPECT_EQ(data.result.success, expect_success);
+  EXPECT_EQ(data.requested_locale, locale);
+  EXPECT_EQ(data.loaded_locale, expected_locale);
+  EXPECT_EQ(data.success, expect_success);
 }
 
 void SetUpCrasAndEnableChromeVox(int volume_percent, bool mute_on) {