Move JS calls out of Dartium code

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

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of $LIBRARYNAME;
 
 class _ChildrenElementList extends ListBase<Element>
     implements NodeListWrapper {
   // Raw Element.
   final Element _element;
@@ skipping 1456 matching lines @@
            // allowing us to check for clobbering that may show up in other accesses.
            if (child["id"] == 'attributes' || child["name"] == 'attributes' ||
                child["id"] == 'lastChild'  || child["name"] == 'lastChild' ||
                child["id"] == 'children' || child["name"] == 'children') {
              return true;
            }
          }
          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"];
   static var _htmlCollection = js.context["HTMLCollection"];
   static var _nodeList = js.context["NodeList"];
 
   static bool _hasCorruptedAttributes(Element element) {
     var attributes = unwrap_jso(element)["attributes"];
     if (!attributes.instanceof(_namedNodeMap)) {
       return true;
     }
     var childNodes = unwrap_jso(element.childNodes);
     var length = childNodes["length"];
     var lastChild = unwrap_jso(element.lastChild);
     if (null != lastChild &&
         lastChild != childNodes[length - 1]) {
       return true;
     }
     var children = unwrap_jso(element._children);
     if (null != children) { // On Safari, children can apparently be null.
       if (!children.instanceof(_htmlCollection) ||
           children.instanceof(_nodeList)) {
         return true;
       }
     }
     return false;
   }
+
+  /// A secondary check for corruption, needed on IE
+  static bool _hasCorruptedAttributesAdditionalCheck(Element element) => false;
 $endif
 
   static String _safeTagName(element) {
     String result = 'element tag unavailable';
     try {
       if (element.tagName is String) {
         result = element.tagName;
       }
     } catch (e) {}
     return result;
@@ skipping 218 matching lines @@
   const ScrollAlignment._internal(this._value);
   toString() => 'ScrollAlignment.$_value';
 
   /// Attempt to align the element to the top of the scrollable area.
   static const TOP = const ScrollAlignment._internal('TOP');
   /// Attempt to center the element in the scrollable area.
   static const CENTER = const ScrollAlignment._internal('CENTER');
   /// Attempt to align the element to the bottom of the scrollable area.
   static const BOTTOM = const ScrollAlignment._internal('BOTTOM');
 }