Stop using shell::GetInstance()->system_tray() in system tray items

ash/system/chromeos/network/network_list_detailed_view_base.h

Index: ash/system/chromeos/network/network_list_detailed_view_base.h
diff --git a/ash/system/chromeos/network/network_list_detailed_view_base.h b/ash/system/chromeos/network/network_list_detailed_view_base.h
index 0a89eb7064625c8b60737ab42e5053c841be55a4..2dd1c297f71f2e9f5af78fd0c87444a8684017d6 100644
--- a/ash/system/chromeos/network/network_list_detailed_view_base.h
+++ b/ash/system/chromeos/network/network_list_detailed_view_base.h
@@ -16,6 +16,7 @@ class BubbleDelegateView;
 namespace ash {
 
 struct NetworkIconInfo;
+class SystemTrayItem;
 
 namespace internal {
 namespace tray {
@@ -25,7 +26,9 @@ class NetworkListDetailedViewBase : public NetworkDetailedView,
                                     public views::ButtonListener,
                                     public ViewClickListener {
  public:
-  NetworkListDetailedViewBase(user::LoginStatus login, int header_string_id);
+  NetworkListDetailedViewBase(SystemTrayItem* tray,
+                              user::LoginStatus login,
+                              int header_string_id);
   virtual ~NetworkListDetailedViewBase();
 
   // Overridden from NetworkDetailedView: