Remove TrayPopupLabelButton (a pre-MD class) and its assets.

ash/common/system/chromeos/network/network_state_list_detailed_view.h

Index: ash/common/system/chromeos/network/network_state_list_detailed_view.h
diff --git a/ash/common/system/chromeos/network/network_state_list_detailed_view.h b/ash/common/system/chromeos/network/network_state_list_detailed_view.h
index 093d73afb71f17b314a1f77d6296c1a8f772c9ba..f9e9b08fe79dfc8a32af89f7b2b62cf5eea83571 100644
--- a/ash/common/system/chromeos/network/network_state_list_detailed_view.h
+++ b/ash/common/system/chromeos/network/network_state_list_detailed_view.h
@@ -34,7 +34,6 @@ namespace ash {
 class SystemTrayItem;
 class ThrobberView;
 class TrayPopupHeaderButton;
-class TrayPopupLabelButton;
 
 namespace tray {
 
@@ -72,7 +71,6 @@ class NetworkStateListDetailedView
   void CreateNetworkExtra();
 
   // Update UI components.
-  void UpdateHeaderButtons();
   void UpdateTechnologyButton(TrayPopupHeaderButton* button,
                               const chromeos::NetworkTypePattern& technology);
 
@@ -80,8 +78,6 @@ class NetworkStateListDetailedView
 
   bool OrderChild(views::View* view, int index);
 
-  void UpdateNetworkExtra();
-
   // Adds a settings entry when logged in, and an entry for changing proxy
   // settings otherwise.
   void CreateSettingsEntry();
@@ -134,18 +130,6 @@ class NetworkStateListDetailedView
   // Not used for material design.
   views::ImageButton* info_icon_;
 
-  // Not used for material design.
-  TrayPopupHeaderButton* button_wifi_;
-
-  // Not used for material design.
-  TrayPopupHeaderButton* button_mobile_;
-
-  TrayPopupLabelButton* other_wifi_;
-  TrayPopupLabelButton* turn_on_wifi_;
-  TrayPopupLabelButton* other_mobile_;
-  TrayPopupLabelButton* settings_;
-  TrayPopupLabelButton* proxy_settings_;
-
   // Only used in material design.
   views::CustomButton* info_button_md_;
   views::CustomButton* settings_button_md_;