Use List instead of Link in the type system.

sdk/lib/_internal/compiler/implementation/compile_time_constants.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 dart2js;
 
 /**
  * The [ConstantHandler] keeps track of compile-time constants,
  * initializations of global and static fields, and default values of
  * optional parameters.
@@ skipping 313 matching lines @@
       }
     }
 
     bool hasProtoKey = (protoValue != null);
     List<Constant> values = map.values.toList();
     InterfaceType sourceType = elements.getType(node);
     DartType keysType;
     if (sourceType.treatAsRaw) {
       keysType = compiler.listClass.rawType;
     } else {
-      Link<DartType> arguments =
-          new Link<DartType>.fromList([sourceType.typeArguments.head]);
+      List<DartType> arguments = <DartType>[sourceType.typeArguments.first];
       keysType = new InterfaceType(compiler.listClass, arguments);
     }
     ListConstant keysList = new ListConstant(keysType, keys);
     String className = onlyStringKeys
         ? (hasProtoKey ? MapConstant.DART_PROTO_CLASS
                        : MapConstant.DART_STRING_CLASS)
         : MapConstant.DART_GENERAL_CLASS;
     ClassElement classElement = compiler.jsHelperLibrary.find(className);
     classElement.ensureResolved(compiler);
-    Link<DartType> typeArgument = sourceType.typeArguments;
+    List<DartType> typeArgument = sourceType.typeArguments;
     InterfaceType type;
     if (sourceType.treatAsRaw) {
       type = classElement.rawType;
     } else {
       type = new InterfaceType(classElement, typeArgument);
     }
     return new MapConstant(type, keysList, values, protoValue, onlyStringKeys);
   }
 
   Constant visitLiteralNull(LiteralNull node) {
@@ skipping 646 matching lines @@
           if (fieldValue == null) {
             // Use the default value.
             fieldValue = handler.compileConstant(field);
           }
           jsNewArguments.add(fieldValue);
         },
         includeSuperAndInjectedMembers: true);
     return jsNewArguments;
   }
 }