Dynamic -> dynamic.

sdk/lib/core/function.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.
 
 // Dart core library.
 
 /**
  * Super-type of all function types.
  *
  * A function value, or an instance of a class with a "call" method, is a
@@ skipping 11 matching lines @@
    * if it expects different parameters.
    *
    * Example: [: Function.apply(foo, [1,2,3], {"f": 4, "g": 5}) :] gives
    * exactly the same result as [: foo(1, 2, 3, f: 4, g: 5) :].
    *
    * If [positionalArguments] is null, it's considered an empty list.
    * If [namedArguments] is omitted or null, it is considered an empty map.
    */
   external static apply(Function function,
                         List positionalArguments,
-                        [Map<String,Dynamic> namedArguments]);
+                        [Map<String,dynamic> namedArguments]);
 }