Canonicalize raw type

sdk/lib/_internal/compiler/implementation/dart_backend/renamer.dart

 // Copyright (c) 2012, 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 dart_backend;
 
 Function get _compareNodes =>
     compareBy((n) => n.getBeginToken().charOffset);
 
 typedef String _Renamer(Renamable renamable);
@@ skipping 70 matching lines @@
     for (Element element in sortElements(map.keys)) {
       f(element, map[element]);
     }
   }
 
   String renameType(DartType type, Function renameElement) {
     // TODO(smok): Do not rename type if it is in platform library or
     // js-helpers.
     StringBuffer result = new StringBuffer(renameElement(type.element));
     if (type is InterfaceType) {
-      if (!type.typeArguments.isEmpty) {
+      if (!type.isRaw) {
         result.add('<');
         Link<DartType> argumentsLink = type.typeArguments;
         result.add(renameType(argumentsLink.head, renameElement));
         for (Link<DartType> link = argumentsLink.tail; !link.isEmpty;
              link = link.tail) {
           result.add(',');
           result.add(renameType(link.head, renameElement));
         }
         result.add('>');
       }
@@ skipping 247 matching lines @@
     index ~/= firstCharAlphabet.length;
     int length = otherCharsAlphabet.length;
     while (index >= length) {
       resultBuilder.add(otherCharsAlphabet[index % length]);
       index ~/= length;
     }
     resultBuilder.add(otherCharsAlphabet[index]);
     return resultBuilder.toString();
   }
 }