Move JS calls out of Dartium code

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 15c6f76a5b5348545f6abc893d9583513b1c07f0..25608df74fbfedd2c54ecb7408b8dbd6c677f396 100644
--- a/tools/dom/templates/html/impl/impl_Element.darttemplate
+++ b/tools/dom/templates/html/impl/impl_Element.darttemplate
@@ -1474,6 +1474,11 @@ $if DART2JS
 	 return false;
           })(#)''', element);
   }
+
+  /// A secondary check for corruption, needed on IE
+  static bool _hasCorruptedAttributesAdditionalCheck(Element element) {
+    return JS('bool', r'!(#.attributes instanceof NamedNodeMap)', element);
+  }
 $else
 
   static var _namedNodeMap = js.context["NamedNodeMap"];
@@ -1501,6 +1506,9 @@ $else
     }
     return false;
   }
+
+  /// A secondary check for corruption, needed on IE
+  static bool _hasCorruptedAttributesAdditionalCheck(Element element) => false;
 $endif
 
   static String _safeTagName(element) {