Use List instead of Link in the type system.

sdk/lib/_internal/compiler/implementation/js_emitter/class_emitter.dart

 // Copyright (c) 2013, 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.
 
 part of dart2js.js_emitter;
 
 class ClassEmitter extends CodeEmitterHelper {
   /**
    * Documentation wanted -- johnniwinther
    *
@@ skipping 283 matching lines @@
   void emitClassBuilderWithReflectionData(String className,
                                           ClassElement classElement,
                                           ClassBuilder classBuilder,
                                           ClassBuilder enclosingBuilder) {
     var metadata = task.metadataEmitter.buildMetadataFunction(classElement);
     if (metadata != null) {
       classBuilder.addProperty("@", metadata);
     }
 
     if (backend.isNeededForReflection(classElement)) {
-      Link typeVars = classElement.typeVariables;
+      List<DartType> typeVars = classElement.typeVariables;
       Iterable typeVariableProperties = task.typeVariableHandler
           .typeVariablesOf(classElement).map(js.toExpression);
 
       ClassElement superclass = classElement.superclass;
       bool hasSuper = superclass != null;
       if ((!typeVariableProperties.isEmpty && !hasSuper) ||
-          (hasSuper && superclass.typeVariables != typeVars)) {
+          (hasSuper && !equalElements(superclass.typeVariables, typeVars))) {
         classBuilder.addProperty('<>',
             new jsAst.ArrayInitializer.from(typeVariableProperties));
       }
     }
 
     List<jsAst.Property> statics = new List<jsAst.Property>();
     ClassBuilder staticsBuilder = new ClassBuilder(namer);
     if (emitFields(classElement, staticsBuilder, null, emitStatics: true)) {
       statics.add(staticsBuilder.toObjectInitializer().properties.single);
     }
@@ skipping 273 matching lines @@
       computeTypeVariable =
           js(r'this.$builtinTypeInfo && this.$builtinTypeInfo[#]', index);
     }
     jsAst.Expression convertRtiToRuntimeType =
         namer.elementAccess(compiler.findHelper('convertRtiToRuntimeType'));
     builder.addProperty(
         name, js.fun(
             [], [js.return_(convertRtiToRuntimeType(computeTypeVariable))]));
   }
 }