dart2js cps: Fix in how type variables are accessed.

pkg/compiler/lib/src/js_backend/codegen/codegen.dart

 // Copyright (c) 2014, 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 code_generator;
 
 import 'glue.dart';
 
 import '../../tree_ir/tree_ir_nodes.dart' as tree_ir;
 import '../../js/js.dart' as js;
@@ skipping 618 matching lines @@
     return buildStaticHelperInvocation(createType,
         [buildStaticHelperInvocation(typeToString,
             [visitExpression(node.value)])]);
   }
 
   @override
   js.Expression visitReadTypeVariable(tree_ir.ReadTypeVariable node) {
     ClassElement context = node.variable.element.enclosingClass;
     js.Expression index = js.number(glue.getTypeVariableIndex(node.variable));
     if (glue.needsSubstitutionForTypeVariableAccess(context)) {
-      js.Expression substitution = glue.getSubstitutionName(context);
+      js.Expression typeName = glue.getRuntimeTypeName(context);
       return buildStaticHelperInvocation(
-          glue.getTypeArgumentWithSubstitution(),
-          [visitExpression(node.target), substitution, index]);
+          glue.getRuntimeTypeArgument(),
+          [visitExpression(node.target), typeName, index]);
     } else {
       return buildStaticHelperInvocation(
           glue.getTypeArgumentByIndex(),
           [visitExpression(node.target), index]);
     }
   }
 
   @override
   js.Expression visitTypeExpression(tree_ir.TypeExpression node) {
     List<js.Expression> arguments =
@@ skipping 20 matching lines @@
 
   @override
   visitVariableDeclaration(tree_ir.VariableDeclaration node) {
     return errorUnsupportedNode(node);
   }
 
   errorUnsupportedNode(tree_ir.DartSpecificNode node) {
     throw "Unsupported node in JS backend: $node";
   }
 }