Make getKeys, getValues getters (keys, values).

utils/pub/yaml/deep_equals.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.
 
 #library("deep_equals");
 
 /**
  * Returns whether two objects are structurally equivalent. This considers NaN
  * values to be equivalent. It also handles self-referential structures.
  */
@@ skipping 40 matching lines @@
     if (!deepEquals(list1[i], list2[i], parents1, parents2)) return false;
   }
 
   return true;
 }
 
 /** Returns whether [map1] and [map2] are structurally equal. */
 bool _mapEquals(Map map1, Map map2, List parents1, List parents2) {
   if (map1.length != map2.length) return false;
 
-  for (var key in map1.getKeys()) {
+  for (var key in map1.keys) {
     if (!map2.containsKey(key)) return false;
     if (!deepEquals(map1[key], map2[key], parents1, parents2)) return false;
   }
 
   return true;
 }
 
 /**
  * Returns whether two doubles are equivalent. This differs from `d1 == d2` in
  * that it considers NaN to be equal to itself.
  */
 bool _doubleEquals(double d1, double d2) {
   if (d1.isNaN && d2.isNaN) return true;
   return d1 == d2;
 }