Add map to dart:dom collections.

client/dom/generated/src/wrapping/_HTMLCollectionWrappingImplementation.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.
 
 // WARNING: Do not edit - generated code.
 
 class _HTMLCollectionWrappingImplementation extends DOMWrapperBase implements HTMLCollection {
   _HTMLCollectionWrappingImplementation() : super() {}
 
   static create__HTMLCollectionWrappingImplementation() native {
@@ skipping 48 matching lines @@
   }
 
   Node last() {
     return this[length - 1];
   }
 
   void forEach(void f(Node element)) {
     _Collections.forEach(this, f);
   }
 
+  Collection map(f(Node element)) {
+    return _Collections.map(this, [], f);
+  }
+
   Collection<Node> filter(bool f(Node element)) {
     return _Collections.filter(this, new List<Node>(), f);
   }
 
   bool every(bool f(Node element)) {
     return _Collections.every(this, f);
   }
 
   bool some(bool f(Node element)) {
     return _Collections.some(this, f);
@@ skipping 28 matching lines @@
   }
   static Node _item(receiver, index) native;
 
   Node namedItem(String name) {
     return _namedItem(this, name);
   }
   static Node _namedItem(receiver, name) native;
 
   String get typeName() { return "HTMLCollection"; }
 }