Better type for _match argument in AttributeMatch

sdk/lib/html/dart2js/html_dart2js.dart

Index: sdk/lib/html/dart2js/html_dart2js.dart
diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index f5708a405377b597c1abbc25f5325ce273ba739e..398149392a04ff9537dafb01898508c1482c01b9 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -41453,7 +41453,7 @@ abstract class _AttributeMap implements Map<String, String> {
   /**
    * Checks to see if the node should be included in this map.
    */
-  bool _matches(Node node);
+  bool _matches(_Attr node);
 }
 
 /**
@@ -41487,7 +41487,7 @@ class _ElementAttributeMap extends _AttributeMap {
     return keys.length;
   }
 
-  bool _matches(Node node) => node._namespaceUri == null;
+  bool _matches(_Attr node) => node._namespaceUri == null;
 }
 
 /**
@@ -41523,7 +41523,7 @@ class _NamespacedAttributeMap extends _AttributeMap {
     return keys.length;
   }
 
-  bool _matches(Node node) => node._namespaceUri == _namespace;
+  bool _matches(_Attr node) => node._namespaceUri == _namespace;
 }
 
 /**