Fix typo.

sdk/lib/collection/collections.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.collection;
 
 /**
  * This class provides default implementations for Iterables (including Lists).
  *
  * Once Dart receives Mixins it will be replaced with mixin classes.
@@ skipping 56 matching lines @@
    * instead of just repeatedly calling remove.
    */
   static void removeAllList(Collection collection, Iterable elementsToRemove) {
     Set setToRemove;
     // Assume contains is efficient on a Set.
     if (elementsToRemove is Set) {
       setToRemove = elementsToRemove;
     } else {
       setToRemove = elementsToRemove.toSet();
     }
-    collection.removeMatching(setToRemve.contains);
+    collection.removeMatching(setToRemove.contains);
   }
 
   /**
    * Simple implemenation for [Collection.retainAll].
    *
    * This implementation assumes that [Collecton.retainMatching] on [collection]
    * is efficient.
    */
   static void retainAll(Collection collection, Iterable elementsToRetain) {
     Set lookup;
@@ skipping 428 matching lines @@
    * Returns true if the specified collection contains the specified object
    * reference.
    */
   static _containsRef(Collection c, Object ref) {
     for (var e in c) {
       if (identical(e, ref)) return true;
     }
     return false;
   }
 }