Move default_locale out of Extension class

chrome/common/extensions/extension_file_util.cc

Index: chrome/common/extensions/extension_file_util.cc
diff --git a/chrome/common/extensions/extension_file_util.cc b/chrome/common/extensions/extension_file_util.cc
index 3137fc7418cf6d5e281807797bfcb4ff58f369bd..bfb7e7eb11176e5651f61f7e30f066a0ef89add5 100644
--- a/chrome/common/extensions/extension_file_util.cc
+++ b/chrome/common/extensions/extension_file_util.cc
@@ -20,6 +20,7 @@
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/extensions/api/extension_action/action_info.h"
+#include "chrome/common/extensions/api/i18n/default_locale_handler.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_l10n_util.h"
 #include "chrome/common/extensions/extension_manifest_constants.h"
@@ -562,7 +563,8 @@ static bool ValidateLocaleInfo(const Extension& extension,
   const FilePath path = extension.path().Append(
       Extension::kLocaleFolder);
   bool path_exists = file_util::PathExists(path);
-  std::string default_locale = extension.default_locale();
+  std::string default_locale =
+      extensions::LocaleInfo::GetDefaultLocale(&extension);
 
   // If both default locale and _locales folder are empty, skip verification.
   if (default_locale.empty() && !path_exists)