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

ash/common/system/tray/label_tray_view.cc

Index: ash/common/system/tray/label_tray_view.cc
diff --git a/ash/common/system/tray/label_tray_view.cc b/ash/common/system/tray/label_tray_view.cc
index d6aa7c116979feed995606b89b927ad08c4eff3d..c1099bef13ebb29dbc1ae86390304f1acf4167e5 100644
--- a/ash/common/system/tray/label_tray_view.cc
+++ b/ash/common/system/tray/label_tray_view.cc
@@ -25,7 +25,6 @@ namespace {
 // TODO(tdanderson): Remove this once material design is enabled by
 // default. See crbug.com/614453.
 const gfx::VectorIcon& ResourceIdToVectorIcon(int resource_id) {
-#if defined(OS_CHROMEOS)
   switch (resource_id) {
     case IDR_AURA_UBER_TRAY_ENTERPRISE:
       return kSystemMenuBusinessIcon;
@@ -39,8 +38,6 @@ const gfx::VectorIcon& ResourceIdToVectorIcon(int resource_id) {
       NOTREACHED();
       break;
   }
-#endif  // defined(OS_CHROMEOS)
-
   return gfx::kNoneIcon;
 }