"Reverting 27844"

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 fd31da0dffe415c5fb8bf0c701a0ced57ca856c3..4e97d224d149db9b75e12b1f3f1e3a3061e3ec1c 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -8966,7 +8966,6 @@ abstract class Element extends Node implements ParentNode, ChildNode native "Ele
   /// This is identical to calling `new Element.tag('video')`.
   factory Element.video() => new Element.tag('video');
 
-  Map<String, String> _cachedAttributeMap;
   /**
    * All attributes on this element.
    *
@@ -8977,12 +8976,7 @@ abstract class Element extends Node implements ParentNode, ChildNode native "Ele
    * (such as 'xlink:href'), additional attributes can be accessed via
    * [getNamespacedAttributes].
    */
-  Map<String, String> get attributes {
-    if (_cachedAttributeMap == null) {
-      _cachedAttributeMap = new _ElementAttributeMap(this);
-    }
-    return _cachedAttributeMap;
-  }
+  Map<String, String> get attributes => new _ElementAttributeMap(this);
 
   void set attributes(Map<String, String> value) {
     Map<String, String> attributes = this.attributes;