Clean up some ash constants.

ash/system/tray/tray_constants.cc

Index: ash/system/tray/tray_constants.cc
diff --git a/ash/system/tray/tray_constants.cc b/ash/system/tray/tray_constants.cc
index 19038b46d36afa9a8f97f898adffd6edf980a9e3..16a4eafcacf1583ad7a3a722433006d086a6ef8d 100644
--- a/ash/system/tray/tray_constants.cc
+++ b/ash/system/tray/tray_constants.cc
@@ -22,6 +22,8 @@ const int kBubblePaddingHorizontalSide = 10;
 const int kBubblePaddingVerticalBottom = 3;
 const int kBubblePaddingVerticalSide = 15;
 
+const int kTrayTextFontSizeIncrease = 2;
+
 // Top inset of system tray bubble for bottom anchor alignment.
 const int kTrayBubbleAnchorTopInsetBottomAnchor = 3;