Use List instead of Link in the type system.

sdk/lib/_internal/compiler/implementation/util/link.dart

 // Copyright (c) 2011, 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.util;
 
 class Link<T> {
   T get head => null;
   Link<T> get tail => null;
 
-  factory Link.fromList(List<T> list) {
-    switch (list.length) {
-      case 0:
-        return new Link<T>();
-      case 1:
-        return new LinkEntry<T>(list[0]);
-      case 2:
-        return new LinkEntry<T>(list[0], new LinkEntry<T>(list[1]));
-      case 3:
-        return new LinkEntry<T>(
-            list[0], new LinkEntry<T>(list[1], new LinkEntry<T>(list[2])));
-    }
-    Link link = new Link<T>();
-    for (int i = list.length ; i > 0; i--) {
-      link = link.prepend(list[i - 1]);
-    }
-    return link;
-  }
-
   const Link();
 
   Link<T> prepend(T element) {
     return new LinkEntry<T>(element, this);
   }
 
   Iterator<T> get iterator => new LinkIterator<T>(this);
 
   void printOn(StringBuffer buffer, [separatedBy]) {
   }
@@ skipping 83 matching lines @@
    * Prepends all elements added to the builder to [tail]. The resulting list is
    * returned and the builder is cleared.
    */
   Link<T> toLink([Link<T> tail = const Link()]);
 
   void addLast(T t);
 
   final int length;
   final bool isEmpty;
 }