Dart: Futures -> Callbacks.

examples/dart/device_info/lib/main.dart

Index: examples/dart/device_info/lib/main.dart
diff --git a/examples/dart/device_info/lib/main.dart b/examples/dart/device_info/lib/main.dart
index f58a95b97ff0c4429aa948589ecb9ab26635da51..e7421177e3367884a2804ecd7748fab4a78fab0f 100644
--- a/examples/dart/device_info/lib/main.dart
+++ b/examples/dart/device_info/lib/main.dart
@@ -17,7 +17,11 @@ class DeviceInfoApp extends Application {
 
   Future initialize(List<String> args, String url) async {
     connectToService("mojo:device_info", _deviceInfo);
-    print(await _deviceInfo.getDeviceType());
+    var c = new Completer();
+    _deviceInfo.getDeviceType((DeviceInfoDeviceType type) {
+      c.complete(type);
+    });
+    print(await _deviceInfo.responseOrError(c.future));
     _deviceInfo.close();
     close();
   }