Remove non-MD code from StatusAreaWidgetDelegate

ash/common/shelf/shelf_constants.h

Index: ash/common/shelf/shelf_constants.h
diff --git a/ash/common/shelf/shelf_constants.h b/ash/common/shelf/shelf_constants.h
index f1180aee6d64e86b47db2fb1a5421ecf17d7e1ce..bc783fe942de1e4347db03f521a3e9f6033db9a9 100644
--- a/ash/common/shelf/shelf_constants.h
+++ b/ash/common/shelf/shelf_constants.h
@@ -30,10 +30,6 @@ extern const int kWorkspaceAreaAutoHideInset;
 // Size of the shelf when auto-hidden.
 ASH_EXPORT extern const int kShelfAutoHideSize;
 
-// Inset between the inner edge of the shelf (towards centre of screen), and
-// the shelf items, notifications, status area etc.
-extern const int kShelfItemInset;
-
 // Animation duration for switching black shelf and dock background on and off.
 ASH_EXPORT extern const int kTimeToSwitchBackgroundMs;