IWYU for TrayEnterprise.

ash/system/chromeos/enterprise/tray_enterprise.h

Index: ash/system/chromeos/enterprise/tray_enterprise.h
diff --git a/ash/system/chromeos/enterprise/tray_enterprise.h b/ash/system/chromeos/enterprise/tray_enterprise.h
index 984ef21e77ba43a13347353664ed8a352b6febef..ed41a7f3150d21f9a5992559aff893a51202faa9 100644
--- a/ash/system/chromeos/enterprise/tray_enterprise.h
+++ b/ash/system/chromeos/enterprise/tray_enterprise.h
@@ -9,12 +9,13 @@
 #include "ash/system/tray/system_tray_item.h"
 #include "ash/system/tray/view_click_listener.h"
 
-namespace ash {
-class SystemTray;
+namespace views {
+class View;
 }
 
 namespace ash {
 class LabelTrayView;
+class SystemTray;
 
 class TrayEnterprise : public SystemTrayItem,
                        public ViewClickListener,