Change List constructors.

sdk/lib/async/future_impl.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_async;
 
 deprecatedFutureValue(_FutureImpl future) => future._resultOrListeners;
 
 
 class _CompleterImpl<T> implements Completer<T> {
@@ skipping 68 matching lines @@
   }
 
   factory _FutureImpl.wait(Iterable<Future> futures) {
     // TODO(ajohnsen): can we do better wrt the generic type T?
     if (futures.isEmpty) {
       return new Future<List>.immediate(const []);
     }
 
     Completer completer = new Completer<List>();
     int remaining = futures.length;
-    List values = new List(futures.length);
+    List values = new List.fixedLength(futures.length);
 
     // As each future completes, put its value into the corresponding
     // position in the list of values.
     int i = 0;
     for (Future future in futures) {
       int pos = i++;
       future.then((Object value) {
         values[pos] = value;
         if (--remaining == 0) {
           completer.complete(values);
@@ skipping 271 matching lines @@
   _FutureWrapper(this._future);
 
   Future then(function(T value)) => _future.then(function);
   Future catchError(function(AsyncError error), {bool test(var error)}) {
     return _future.catchError(function, test: test);
   }
   Future subscribe({onValue(T value), onError(AsyncError error)}) {
     _future.subscribe(onValue: onValue, onError: onError);
   }
 }