Make List.from and Iterable.toList default to not growable.

sdk/lib/_internal/compiler/implementation/util/link_implementation.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 util_implementation;
 
 class LinkIterator<T> implements Iterator<T> {
   T _current;
   Link<T> _link;
 
@@ skipping 63 matching lines @@
       if (link.isEmpty) {
         throw new RangeError('Index $n out of range');
       }
       link = link.tail;
     }
     return link;
   }
 
   bool get isEmpty => false;
 
-  List<T> toList({ bool growable: false }) {
+  List<T> toList({ bool growable: true }) {
     return new List<T>.from(this, growable: growable);
   }
 
   void forEach(void f(T element)) {
     for (Link<T> link = this; !link.isEmpty; link = link.tail) {
       f(link.head);
     }
   }
 
   bool operator ==(other) {
@@ skipping 34 matching lines @@
     if (head == null) {
       head = entry;
     } else {
       lastLink.tail = entry;
     }
     lastLink = entry;
   }
 
   bool get isEmpty => length == 0;
 }