Remove non-MD code from StatusAreaWidgetDelegate

ash/common/shelf/shelf_constants.cc

Index: ash/common/shelf/shelf_constants.cc
diff --git a/ash/common/shelf/shelf_constants.cc b/ash/common/shelf/shelf_constants.cc
index 4c7db93a3a263677b3d0d98aae843bd531808254..80aafcd1c7a250e6db6c9369567df6a3a792a018 100644
--- a/ash/common/shelf/shelf_constants.cc
+++ b/ash/common/shelf/shelf_constants.cc
@@ -13,7 +13,6 @@ const int kTimeToSwitchBackgroundMs = 1000;
 const int kWorkspaceAreaVisibleInset = 2;
 const int kWorkspaceAreaAutoHideInset = 5;
 const int kShelfAutoHideSize = 3;
-const int kShelfItemInset = 3;
 const SkColor kShelfDefaultBaseColor = SK_ColorBLACK;
 const int kShelfButtonSize = 48;
 const int kShelfButtonSpacing = 16;