"Reverting 27844"

tools/dom/templates/html/impl/impl_Element.darttemplate

Index: tools/dom/templates/html/impl/impl_Element.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_Element.darttemplate b/tools/dom/templates/html/impl/impl_Element.darttemplate
index 8ebf3b16f52544d3cb36c85ac70652fa507bae6b..5732c1ebd5469464a8cdc917a75156394a97d705 100644
--- a/tools/dom/templates/html/impl/impl_Element.darttemplate
+++ b/tools/dom/templates/html/impl/impl_Element.darttemplate
@@ -500,7 +500,6 @@ $(ANNOTATIONS)abstract class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
   /// 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.
    *
@@ -511,12 +510,7 @@ $(ANNOTATIONS)abstract class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
    * (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;