Dart: Renames dart:mojo_blah -> mojo:blah

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:mojo_bindings' as bindings;
-import 'dart:mojo_core' as core;
 import 'dart:typed_data';
+import 'mojo:bindings' as bindings;
+import 'mojo:core' 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 extends sample.Provider {
   ProviderImpl(core.MojoMessagePipeEndpoint endpoint) : super(endpoint) {
     super.delegate = this;
   }
@@ skipping 96 matching lines @@
   testSerializeNamedRegion();
   testSerializeArrayValueTypes();
 }
 
 
 main() async {
   testSerializeStructs();
   await testCallResponse();
   await testAwaitCallResponse();
 }