Check for duplicate library names

test/codegen/expect/sunflower/sunflower.html

Index: test/codegen/expect/sunflower/sunflower.html
diff --git a/test/codegen/expect/sunflower/sunflower.html b/test/codegen/expect/sunflower/sunflower.html
index edf91cd321300daf2983fa9f02eb92d21426db71..ea01f7f0b02344a86579f5a53c788f53d7136418 100644
--- a/test/codegen/expect/sunflower/sunflower.html
+++ b/test/codegen/expect/sunflower/sunflower.html
@@ -29,22 +29,22 @@
 <script src="dev_compiler/runtime/dart/collection.js"></script>
 <script src="dev_compiler/runtime/dart/_internal.js"></script>
 <script src="dev_compiler/runtime/dart/math.js"></script>
+<script src="dev_compiler/runtime/dart/_interceptors.js"></script>
 <script src="dev_compiler/runtime/dart/async.js"></script>
 <script src="dev_compiler/runtime/dart/_foreign_helper.js"></script>
 <script src="dev_compiler/runtime/dart/_js_embedded_names.js"></script>
 <script src="dev_compiler/runtime/dart/_js_helper.js"></script>
 <script src="dev_compiler/runtime/dart/isolate.js"></script>
 <script src="dev_compiler/runtime/dart/typed_data.js"></script>
+<script src="dev_compiler/runtime/dart/_native_typed_data.js"></script>
 <script src="dev_compiler/runtime/dart/_isolate_helper.js"></script>
 <script src="dev_compiler/runtime/dart/_js_primitives.js"></script>
-<script src="dev_compiler/runtime/dart/_interceptors.js"></script>
 <script src="dev_compiler/runtime/dart/convert.js"></script>
-<script src="dev_compiler/runtime/dart/_native_typed_data.js"></script>
 <script src="circle.js"></script>
 <script src="dom.js"></script>
 <script src="painter.js"></script>
 <script src="sunflower.js"></script>
-<script>_isolate_helper.startRootIsolate(sunflower.main, []);</script>
+<script>dart.start('sunflower');</script>