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

ash/common/system/tray/system_tray.cc

Index: ash/common/system/tray/system_tray.cc
diff --git a/ash/common/system/tray/system_tray.cc b/ash/common/system/tray/system_tray.cc
index bf77079841f884a8a62c18b7cdb6fb077657de4d..cb725a9d4b6603c4ed781c986ee97dd0e596ddcb 100644
--- a/ash/common/system/tray/system_tray.cc
+++ b/ash/common/system/tray/system_tray.cc
@@ -216,7 +216,6 @@
       tray_audio_(nullptr),
       tray_cast_(nullptr),
       tray_date_(nullptr),
-      tray_network_(nullptr),
       tray_tiles_(nullptr),
       tray_system_info_(nullptr),
       tray_update_(nullptr),
@@ -291,8 +290,7 @@
   AddTrayItem(tray_accessibility_);
   AddTrayItem(new TrayTracing(this));
   AddTrayItem(new TrayPower(this, message_center::MessageCenter::Get()));
-  tray_network_ = new TrayNetwork(this);
-  AddTrayItem(tray_network_);
+  AddTrayItem(new TrayNetwork(this));
   AddTrayItem(new TrayVPN(this));
   AddTrayItem(new TraySms(this));
   AddTrayItem(new TrayBluetooth(this));
@@ -810,10 +808,6 @@
   return tray_date_;
 }
 
-TrayNetwork* SystemTray::GetTrayNetworkForTesting() const {
-  return tray_network_;
-}
-
 TraySystemInfo* SystemTray::GetTraySystemInfoForTesting() const {
   return tray_system_info_;
 }