Revert of Add test for system tray network menu icon for extension-controlled networks

ash/common/system/tray/system_tray.h

Index: ash/common/system/tray/system_tray.h
diff --git a/ash/common/system/tray/system_tray.h b/ash/common/system/tray/system_tray.h
index 1df9954a666fa10a5a85e57550766d53d10f958c..0e5ed5b1f915c6f6c2b950c36536d7f91a8192a5 100644
--- a/ash/common/system/tray/system_tray.h
+++ b/ash/common/system/tray/system_tray.h
@@ -29,7 +29,6 @@
 class TrayAudio;
 class TrayCast;
 class TrayDate;
-class TrayNetwork;
 class TraySystemInfo;
 class TrayTiles;
 class TrayUpdate;
@@ -165,7 +164,6 @@
 
   TrayCast* GetTrayCastForTesting() const;
   TrayDate* GetTrayDateForTesting() const;
-  TrayNetwork* GetTrayNetworkForTesting() const;
   TraySystemInfo* GetTraySystemInfoForTesting() const;
   TrayTiles* GetTrayTilesForTesting() const;
   TrayUpdate* GetTrayUpdateForTesting() const;
@@ -269,7 +267,6 @@
   TrayAudio* tray_audio_;  // May be null.
   TrayCast* tray_cast_;
   TrayDate* tray_date_;    // null for material design.
-  TrayNetwork* tray_network_;
   TrayTiles* tray_tiles_;  // only used in material design.
   TraySystemInfo* tray_system_info_;  // only used in material design.
   TrayUpdate* tray_update_;