Rationalize Dart mojo and sky package structure

sky/tests/services/network.sky

Index: sky/tests/services/network.sky
diff --git a/sky/tests/services/network.sky b/sky/tests/services/network.sky
index 810db1550f35151783ac2a8790abde9fb166dceb..2f64bf62bbdaae4634b80e435493b0aa4e622578 100644
--- a/sky/tests/services/network.sky
+++ b/sky/tests/services/network.sky
@@ -1,16 +1,17 @@
 #!mojo mojo:sky_viewer
 <sky>
 <script>
-import '/sky/framework/embedder.dart';
 import 'dart:async';
 import 'dart:typed_data';
 import "dart:sky.internals" as internals;
 
-import 'package:mojo/public/dart/bindings.dart';
-import 'package:mojo/public/dart/core.dart';
+import 'package:mojo/bindings.dart';
+import 'package:mojo/core.dart';
 import 'package:mojom/mojo/network_service.mojom.dart';
 import 'package:mojom/mojo/url_loader.mojom.dart';
 
+import 'package:sky/framework/embedder.dart';
+
 Future<String> run(url) async {
   var networkService= new NetworkServiceProxy.unbound();
   embedder.connectToService("mojo:network_service", networkService);