chromeos: Remove OS ifdefs from ash/common/system/tray

ash/common/system/tray/tray_notification_view.cc

Index: ash/common/system/tray/tray_notification_view.cc
diff --git a/ash/common/system/tray/tray_notification_view.cc b/ash/common/system/tray/tray_notification_view.cc
index de4345d5bfec043efb7ad85f64c443fef25e55c6..f6a16a8a49257fbda4c8ba0e88e987c5fa33a18c 100644
--- a/ash/common/system/tray/tray_notification_view.cc
+++ b/ash/common/system/tray/tray_notification_view.cc
@@ -29,10 +29,8 @@ const gfx::VectorIcon& ResourceIdToVectorIcon(int resource_id) {
   switch (resource_id) {
     case IDR_AURA_UBER_TRAY_ACCESSIBILITY_DARK:
       return kSystemMenuAccessibilityIcon;
-#if defined(OS_CHROMEOS)
     case IDR_AURA_UBER_TRAY_SMS:
       return kSystemMenuSmsIcon;
-#endif
     default:
       NOTREACHED();
       break;