Reapply "Remove Object.dynamic."

samples/ui_lib/util/CollectionUtils.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.
 
 typedef num NumericValueSelector<T>(T value);
 
 /**
  * General purpose collection utilities.
  * TODO(jmesserly): make these top level functions?
  */
@@ skipping 28 matching lines @@
   }
 
   // Collection<T> supports most of the ES 5 list methods, but it's missing
   // map.
 
   // TODO(jmesserly): we might want a version of this that return an iterable,
   // however JS, Python and Ruby versions are all eager.
   static List map(Iterable source, var mapper) {
     // TODO(jmesserly): I was trying to set the capacity here, but instead it
     // seems to create a fixed list. Hence assigning by index below.
-    List result = new List(source is List ? source.dynamic.length : null);
+    List result = new List(source is List ? (source as List).length : null);
     int i = 0;
     for (final item in source) {
       result[i++] = mapper(item);
     }
     return result;
   }
 
   /**
    * Finds the item in [source] that matches [test].  Returns null if
    * no item matches.  The typing should be:
@@ skipping 70 matching lines @@
   }
 
   // TODO(jmesserly): something like should exist on Map, either a method or a
   // constructor, see bug #5340679
   static void copyMap(Map dest, Map source) {
     for (final k in source.getKeys()) {
       dest[k] = source[k];
     }
   }
 }