Extract l10n-related parts of NetworkScreenHandler to a helper file

chrome/browser/chromeos/customization_document.h

Index: chrome/browser/chromeos/customization_document.h
diff --git a/chrome/browser/chromeos/customization_document.h b/chrome/browser/chromeos/customization_document.h
index ad1b1f6c617f22eadbf6f548aa874c090148b0b1..4322855ea0df753589e0ae5455b8f57d55a89baf 100644
--- a/chrome/browser/chromeos/customization_document.h
+++ b/chrome/browser/chromeos/customization_document.h
@@ -37,14 +37,13 @@ namespace user_prefs {
 class PrefRegistrySyncable;
 }
 
-// This test is in global namespace so it must be declared here.
-void Test__InitStartupCustomizationDocument(const std::string& manifest);
-
 namespace chromeos {
 
 class CustomizationWallpaperDownloader;
 class ServicesCustomizationExternalLoader;
 
+void InitStartupCustomizationDocumentForTesting(const std::string& manifest);
+
 namespace system {
 class StatisticsProvider;
 }  // system
@@ -107,7 +106,7 @@ class StartupCustomizationDocument : public CustomizationDocument {
   FRIEND_TEST_ALL_PREFIXES(StartupCustomizationDocumentTest, BadManifest);
   FRIEND_TEST_ALL_PREFIXES(ServicesCustomizationDocumentTest, MultiLanguage);
   friend class OobeLocalizationTest;
-  friend void ::Test__InitStartupCustomizationDocument(
+  friend void InitStartupCustomizationDocumentForTesting(
       const std::string& manifest);
   friend struct DefaultSingletonTraits<StartupCustomizationDocument>;