Remove ash tray utility functions that are no-ops in MD.

ash/common/system/chromeos/network/tray_network.cc

Index: ash/common/system/chromeos/network/tray_network.cc
diff --git a/ash/common/system/chromeos/network/tray_network.cc b/ash/common/system/chromeos/network/tray_network.cc
index decfc5a7a80669b4cef35766f09272ecb72981d0..870c776220e551707507488d6caa75cf7c7d9716 100644
--- a/ash/common/system/chromeos/network/tray_network.cc
+++ b/ash/common/system/chromeos/network/tray_network.cc
@@ -303,13 +303,6 @@ void TrayNetwork::DestroyDetailedView() {
   detailed_ = NULL;
 }
 
-void TrayNetwork::UpdateAfterLoginStatusChange(LoginStatus status) {}
-
-void TrayNetwork::UpdateAfterShelfAlignmentChange(ShelfAlignment alignment) {
-  if (tray_)
-    SetTrayImageItemBorder(tray_, alignment);
-}
-
 void TrayNetwork::RequestToggleWifi() {
   // This will always be triggered by a user action (e.g. keyboard shortcut)
   if (!detailed_ ||