Better type for _match argument in AttributeMatch

tools/dom/src/AttributeMap.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 html;
 
 abstract class _AttributeMap implements Map<String, String> {
   final Element _element;
 
   _AttributeMap(this._element);
@@ skipping 67 matching lines @@
   }
 
   /**
    * Returns true if there is at least one {key, value} pair in the map.
    */
   bool get isNotEmpty => !isEmpty;
 
   /**
    * Checks to see if the node should be included in this map.
    */
-  bool _matches(Node node);
+  bool _matches(_Attr node);
 }
 
 /**
  * Wrapper to expose [Element.attributes] as a typed map.
  */
 class _ElementAttributeMap extends _AttributeMap {
   _ElementAttributeMap(Element element) : super(element);
 
   bool containsKey(Object key) {
     return _element._hasAttribute(key);
@@ skipping 13 matching lines @@
     return value;
   }
 
   /**
    * The number of {key, value} pairs in the map.
    */
   int get length {
     return keys.length;
   }
 
-  bool _matches(Node node) => node._namespaceUri == null;
+  bool _matches(_Attr node) => node._namespaceUri == null;
 }
 
 /**
  * Wrapper to expose namespaced attributes as a typed map.
  */
 class _NamespacedAttributeMap extends _AttributeMap {
   final String _namespace;
 
   _NamespacedAttributeMap(Element element, this._namespace) : super(element);
 
@@ skipping 15 matching lines @@
     return value;
   }
 
   /**
    * The number of {key, value} pairs in the map.
    */
   int get length {
     return keys.length;
   }
 
-  bool _matches(Node node) => node._namespaceUri == _namespace;
+  bool _matches(_Attr node) => node._namespaceUri == _namespace;
 }
 
 /**
  * Provides a Map abstraction on top of data-* attributes, similar to the
  * dataSet in the old DOM.
  */
 class _DataAttributeMap implements Map<String, String> {
   final Map<String, String> _attributes;
 
   _DataAttributeMap(this._attributes);
@@ skipping 91 matching lines @@
   String _toHyphenedName(String word) {
     var sb = new StringBuffer();
     for (int i = 0; i < word.length; i++) {
       var lower = word[i].toLowerCase();
       if (word[i] != lower && i > 0) sb.write('-');
       sb.write(lower);
     }
     return sb.toString();
   }
 }