Replace 'Scanning' text in Network Status Area with throbber

ui/chromeos/network/network_list.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_CHROMEOS_NETWORK_NETWORK_LIST_H_
 #define UI_CHROMEOS_NETWORK_NETWORK_LIST_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 40 matching lines @@
                              bool highlighted);
   bool UpdateNetworkChild(int index, const NetworkInfo* info);
   bool PlaceViewAtIndex(views::View* view, int index);
   bool UpdateInfoLabel(int message_id, int index, views::Label** label);
 
   // network_icon::AnimationObserver:
   void NetworkIconChanged() override;
 
   NetworkListDelegate* delegate_;
 
-  views::Label* scanning_view_;
   views::Label* no_wifi_networks_view_;
   views::Label* no_cellular_networks_view_;
 
   // An owned list of network info.
   ScopedVector<NetworkInfo> network_list_;
 
   typedef std::map<views::View*, std::string> NetworkMap;
   NetworkMap network_map_;
 
   // A map of network service paths to their view.
   typedef std::map<std::string, views::View*> ServicePathMap;
   ServicePathMap service_path_map_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkListView);
 };
 
 }  // namespace ui
 
 #endif  // UI_CHROMEOS_NETWORK_NETWORK_LIST_H_