Remove pre-MD code related to tray/menu user profiles.

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 5d51783217443c46b2fff48f895eaf5a7b8c6e46..8c0c1363269ad01e9a3d5d1f700c805248bc6ea6 100644
--- a/ash/common/system/tray/tray_utils.h
+++ b/ash/common/system/tray/tray_utils.h
@@ -30,12 +30,6 @@ void SetTrayImageItemBorder(views::View* tray_view, ShelfAlignment alignment);
 // around it.
 void SetTrayLabelItemBorder(TrayItemView* tray_view, ShelfAlignment alignment);
 
-// Computes an accessible label for this button based on all descendant view
-// labels by concatenating them in depth-first order.
-void GetAccessibleLabelFromDescendantViews(
-    views::View* view,
-    std::vector<base::string16>& out_labels);
-
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_TRAY_TRAY_UTILS_H_