Better type for _match argument in AttributeMatch

sdk/lib/html/dartium/html_dartium.dart

Index: sdk/lib/html/dartium/html_dartium.dart
diff --git a/sdk/lib/html/dartium/html_dartium.dart b/sdk/lib/html/dartium/html_dartium.dart
index b463fbfa268e78eccc1348377f82bb878f10db4f..6bcdb02dd9399a1715ebce0b3fb99c8c7c46d488 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -41262,11 +41262,11 @@ class Url extends DartHtmlDomObject implements UrlUtils {
       return _blink.BlinkURL.instance
           .createObjectURL_Callback_1_(blob_OR_source_OR_stream);
     }
-    if ((blob_OR_source_OR_stream is MediaStream)) {
+    if ((blob_OR_source_OR_stream is MediaSource)) {
       return _blink.BlinkURL.instance
           .createObjectURL_Callback_1_(blob_OR_source_OR_stream);
     }
-    if ((blob_OR_source_OR_stream is MediaSource)) {
+    if ((blob_OR_source_OR_stream is MediaStream)) {
       return _blink.BlinkURL.instance
           .createObjectURL_Callback_1_(blob_OR_source_OR_stream);
     }
@@ -47774,7 +47774,7 @@ 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);
 }
 
 /**
@@ -47808,7 +47808,7 @@ class _ElementAttributeMap extends _AttributeMap {
     return keys.length;
   }
 
-  bool _matches(Node node) => node._namespaceUri == null;
+  bool _matches(_Attr node) => node._namespaceUri == null;
 }
 
 /**
@@ -47844,7 +47844,7 @@ class _NamespacedAttributeMap extends _AttributeMap {
     return keys.length;
   }
 
-  bool _matches(Node node) => node._namespaceUri == _namespace;
+  bool _matches(_Attr node) => node._namespaceUri == _namespace;
 }
 
 /**