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

ash/common/system/tray/tray_utils.h

Index: ash/common/system/tray/tray_utils.h
diff --git a/ash/common/system/tray/tray_utils.h b/ash/common/system/tray/tray_utils.h
index 8c0c1363269ad01e9a3d5d1f700c805248bc6ea6..a746af0c0e007ddf58cd03c530f72c6c867f5e48 100644
--- a/ash/common/system/tray/tray_utils.h
+++ b/ash/common/system/tray/tray_utils.h
@@ -5,31 +5,15 @@
 #ifndef ASH_COMMON_SYSTEM_TRAY_TRAY_UTILS_H_
 #define ASH_COMMON_SYSTEM_TRAY_TRAY_UTILS_H_
 
-#include <vector>
-
-#include "ash/public/cpp/shelf_types.h"
-#include "base/strings/string16.h"
-
 namespace views {
 class Label;
-class View;
 }
 
 namespace ash {
 
-class TrayItemView;
-
 // Sets up a Label properly for the tray (sets color, font etc.).
 void SetupLabelForTray(views::Label* label);
 
-// TODO(jennyz): refactor these two functions to SystemTrayItem.
-// Sets the empty border of an image tray item for adjusting the space
-// around it.
-void SetTrayImageItemBorder(views::View* tray_view, ShelfAlignment alignment);
-// Sets the empty border around a label tray item for adjusting the space
-// around it.
-void SetTrayLabelItemBorder(TrayItemView* tray_view, ShelfAlignment alignment);
-
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_TRAY_TRAY_UTILS_H_