Check for duplicate library names

lib/runtime/dart/typed_data.js

Index: lib/runtime/dart/typed_data.js
diff --git a/lib/runtime/dart/typed_data.js b/lib/runtime/dart/typed_data.js
index 364cc0b602830834cf8f5bec3eecef7dc29507e9..30e006252ebc54df53263e72137d974c1c528f6a 100644
--- a/lib/runtime/dart/typed_data.js
+++ b/lib/runtime/dart/typed_data.js
@@ -1,7 +1,8 @@
-var typed_data = dart.defineLibrary(typed_data, {});
-var core = dart.import(core);
-var _native_typed_data = dart.lazyImport(_native_typed_data);
-(function(exports, core, _native_typed_data) {
+dart.library('dart/typed_data', null, /* Imports */[
+  'dart/core'
+], /* Lazy imports */[
+  'dart/_native_typed_data'
+], function(exports, core, _native_typed_data) {
   'use strict';
   class ByteBuffer extends core.Object {}
   class TypedData extends core.Object {}
@@ -977,4 +978,4 @@ var _native_typed_data = dart.lazyImport(_native_typed_data);
   exports.Float32x4 = Float32x4;
   exports.Int32x4 = Int32x4;
   exports.Float64x2 = Float64x2;
-})(typed_data, core, _native_typed_data);
+});