Enable devices page UI on MacOSX

chrome/browser/local_discovery/privet_notifications.h

Index: chrome/browser/local_discovery/privet_notifications.h
diff --git a/chrome/browser/local_discovery/privet_notifications.h b/chrome/browser/local_discovery/privet_notifications.h
index b457e7d95455e2da71ee560dbe90898228d1f5dd..94cfb696d66c261c900abd2d4b7e4cc09eed3691 100644
--- a/chrome/browser/local_discovery/privet_notifications.h
+++ b/chrome/browser/local_discovery/privet_notifications.h
@@ -26,9 +26,12 @@ class ServiceDiscoverySharedClient;
 class PrivetDeviceLister;
 class PrivetHTTPAsynchronousFactory;
 class PrivetHTTPResolution;
-class PrivetTrafficDetector;
 struct DeviceDescription;
 
+#if defined(ENABLE_MDNS)
+class PrivetTrafficDetector;
+#endif  // ENABLE_MDNS
+
 // Contains logic related to notifications not tied actually displaying them.
 class PrivetNotificationsListener  {
  public:
@@ -116,9 +119,12 @@ class PrivetNotificationService
   content::BrowserContext* profile_;
   scoped_ptr<PrivetDeviceLister> device_lister_;
   scoped_refptr<ServiceDiscoverySharedClient> service_discovery_client_;
-  scoped_refptr<PrivetTrafficDetector> traffic_detector_;
   scoped_ptr<PrivetNotificationsListener> privet_notifications_listener_;
   BooleanPrefMember enable_privet_notification_member_;
+
+#if defined(ENABLE_MDNS)
+  scoped_refptr<PrivetTrafficDetector> traffic_detector_;
+#endif  // ENABLE_MDNS
 };
 
 class PrivetNotificationDelegate : public NotificationDelegate {