Dart: Removes all but native calls and the handle watcher from the snapshot.

mojo/dart/test/bindings_generation_test.dart

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 import 'dart:async';
 import 'dart:isolate';
 import 'dart:typed_data';
-import 'dart:mojo.bindings' as bindings;
-import 'dart:mojo.core' as core;
+
+import 'package:mojo/public/dart/bindings.dart' as bindings;
+import 'package:mojo/public/dart/core.dart' as core;
 
 import 'package:mojo/dart/testing/expect.dart';
 import 'package:mojo/public/interfaces/bindings/tests/sample_interfaces.mojom.dart'
     as sample;
 import 'package:mojo/public/interfaces/bindings/tests/test_structs.mojom.dart'
     as structs;
 import 'package:mojo/public/interfaces/bindings/tests/rect.mojom.dart' as rect;
 
 class ProviderImpl implements sample.Provider {
   sample.ProviderStub _stub;
@@ skipping 108 matching lines @@
     Expect.isTrue(b);
   });
 }
 
 main() async {
   testSerializeStructs();
   await testCallResponse();
   await testAwaitCallResponse();
   await runOnClosedTest();
 }