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

ash/common/system/ime/tray_ime_chromeos.cc

Index: ash/common/system/ime/tray_ime_chromeos.cc
diff --git a/ash/common/system/ime/tray_ime_chromeos.cc b/ash/common/system/ime/tray_ime_chromeos.cc
index 484ad9c04f04828e621b652c0b4263a70ea18a93..ed91e79ac75a119d38f0f47ff5ae7be54f812bed 100644
--- a/ash/common/system/ime/tray_ime_chromeos.cc
+++ b/ash/common/system/ime/tray_ime_chromeos.cc
@@ -269,7 +269,6 @@ void TrayIME::UpdateTrayLabel(const IMEInfo& current, size_t count) {
     } else {
       tray_label_->label()->SetText(current.short_name);
     }
-    SetTrayLabelItemBorder(tray_label_, system_tray()->shelf_alignment());
     tray_label_->Layout();
   }
 }
@@ -333,13 +332,6 @@ void TrayIME::DestroyDetailedView() {
   detailed_ = NULL;
 }
 
-void TrayIME::UpdateAfterLoginStatusChange(LoginStatus status) {}
-
-void TrayIME::UpdateAfterShelfAlignmentChange(ShelfAlignment alignment) {
-  SetTrayLabelItemBorder(tray_label_, alignment);
-  tray_label_->Layout();
-}
-
 void TrayIME::OnIMERefresh() {
   // Caches the current ime state.
   SystemTrayDelegate* delegate = WmShell::Get()->system_tray_delegate();