Reuse the code within UpdateCheckMark()

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 a746af0c0e007ddf58cd03c530f72c6c867f5e48..da796af2fdb27c9c2e021422ea4378e50041610d 100644
--- a/ash/common/system/tray/tray_utils.h
+++ b/ash/common/system/tray/tray_utils.h
@@ -10,10 +10,14 @@ class Label;
 }
 
 namespace ash {
+class HoverHighlightView;
 
 // Sets up a Label properly for the tray (sets color, font etc.).
 void SetupLabelForTray(views::Label* label);
 
+// Update the check mark when check or uncheck an item in system menu.
+void SetCheckMarkVisible(HoverHighlightView* container);
+void SetCheckMarkInvisible(HoverHighlightView* container);
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_TRAY_TRAY_UTILS_H_