chromeos: Remove old status-area related code.

chrome/browser/chromeos/status/data_promo_notification.h

Index: chrome/browser/chromeos/status/data_promo_notification.h
diff --git a/chrome/browser/chromeos/status/data_promo_notification.h b/chrome/browser/chromeos/status/data_promo_notification.h
index e41efdd810cb881d76eaf150c18a6c28957cacd0..5e3c79e31cc3440d7f8cde502009d6d87521d42e 100644
--- a/chrome/browser/chromeos/status/data_promo_notification.h
+++ b/chrome/browser/chromeos/status/data_promo_notification.h
@@ -10,6 +10,8 @@
 #include "base/memory/weak_ptr.h"
 #include "ui/views/widget/widget.h"
 
+class PrefService;
+
 namespace views {
 class View;
 }  // namespace views
@@ -24,6 +26,8 @@ class DataPromoNotification : public views::Widget::Observer {
   DataPromoNotification();
   virtual ~DataPromoNotification();
 
+  static void RegisterPrefs(PrefService* local_state);
+
   const std::string& deal_info_url() const { return deal_info_url_; }
   const std::string& deal_topup_url() const { return deal_topup_url_; }