Fix Array constructor bug impacting dart2js and ddc running on the same page.

lib/src/codegen/js_codegen.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library dev_compiler.src.codegen.js_codegen;
 
 import 'dart:collection' show HashSet, HashMap;
 
 import 'package:analyzer/analyzer.dart' hide ConstantEvaluator;
 import 'package:analyzer/src/generated/ast.dart' hide ConstantEvaluator;
@@ skipping 339 matching lines @@
         // the native JS type eagerly at this point.
         // If we wanted to support laziness, we could defer the hookup until
         // the end of the Dart library cycle load.
         assert(!_lazyClass(type));
 
         // TODO(jmesserly): this copies the dynamic members.
         // Probably fine for objects coming from JS, but not if we actually
         // want to support construction of instances with generic types other
         // than dynamic. See issue #154 for Array and List<E> related bug.
         var copyMembers = js.statement(
-            'dart.copyProperties(dart.global.#.prototype, #.prototype);', [
+            'dart.registerExtension(dart.global.#, #);', [
           _propertyName(jsPeerName),
           classElem.name
         ]);
         return _statement([result, copyMembers]);
       }
     }
     return result;
   }
 
   @override
@@ skipping 2098 matching lines @@
 // TODO(jmesserly): validate the library. See issue #135.
 bool _isJsNameAnnotation(DartObjectImpl value) => value.type.name == 'JsName';
 
 bool _isJsPeerInterface(DartObjectImpl value) =>
     value.type.name == 'JsPeerInterface';
 
 // TODO(jacobr): we would like to do something like the following
 // but we don't have summary support yet.
 // bool _supportJsExtensionMethod(AnnotatedNode node) =>
 //    _getAnnotation(node, "SupportJsExtensionMethod") != null;