Removing ElementList.

lib/html/templates/html/impl/impl_DocumentFragment.darttemplate

 // Copyright (c) 2011, 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.
 
-class FilteredElementList implements ElementList {
+class _FilteredElementList implements List {
   final Node _node;
   final NodeList _childNodes;
 
-  FilteredElementList(Node node): _childNodes = node.nodes, _node = node;
+  _FilteredElementList(Node node): _childNodes = node.nodes, _node = node;
 
   // We can't memoize this, since it's possible that children will be messed
   // with externally to this class.
   //
   // TODO(nweiz): Do we really need to copy the list to make the types work out?
   List<Element> get _filtered =>
     new List.from(_childNodes.filter((n) => n is Element));
 
-  // Don't use _filtered.first so we can short-circuit once we find an element.
-  Element get first {
-    for (final node in _childNodes) {
-      if (node is Element) {
-        return node;
-      }
-    }
-    return null;
-  }
-
   void forEach(void f(Element element)) {
     _filtered.forEach(f);
   }
 
   void operator []=(int index, Element value) {
     this[index].replaceWith(value);
   }
 
   void set length(int newLength) {
     final len = this.length;
@@ skipping 90 matching lines @@
   void _write(Set s) {
     throw const UnsupportedOperationException(
         'frozen class set cannot be modified');
   }
   Set<String> _read() => new Set<String>();
 
   bool get frozen => true;
 }
 
 class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
-  ElementList _elements;
+  List<Element> _elements;
 
-  ElementList get elements {
+  List<Element> get elements {
     if (_elements == null) {
-      _elements = new FilteredElementList(this);
+      _elements = new _FilteredElementList(this);
     }
     return _elements;
   }
 
   // TODO: The type of value should be Collection<Element>. See http://b/5392897
   void set elements(value) {
     // Copy list first since we don't want liveness during iteration.
     List copy = new List.from(value);
     final elements = this.elements;
     elements.clear();
@@ skipping 24 matching lines @@
     // Copy list first since we don't want liveness during iteration.
     List nodes = new List.from(e.nodes);
     this.nodes.addAll(nodes);
   }
 
   Node _insertAdjacentNode(String where, Node node) {
     switch (where.toLowerCase()) {
       case "beforebegin": return null;
       case "afterend": return null;
       case "afterbegin":
-        this.insertBefore(node, this.nodes.first);
+        var first = this.nodes.length > 0 ? this.nodes[0] : null;
+        this.insertBefore(node, first);
         return node;
       case "beforeend":
         this.nodes.add(node);
         return node;
       default:
         throw new ArgumentError("Invalid position ${where}");
     }
   }
 
   Element insertAdjacentElement(String where, Element element)
@@ skipping 28 matching lines @@
   bool get draggable => false;
   bool get hidden => false;
   bool get spellcheck => false;
   bool get translate => false;
   int get tabIndex => -1;
   String get id => "";
   String get title => "";
   String get tagName => "";
   String get webkitdropzone => "";
   String get webkitRegionOverflow => "";
-  Element get $m_firstElementChild() => elements.first();
+  Element get $m_firstElementChild {
+    if (elements.length > 0) {
+      return elements[0];
+    }
+    return null;
+  }
   Element get $m_lastElementChild() => elements.last();
   Element get nextElementSibling => null;
   Element get previousElementSibling => null;
   Element get offsetParent => null;
   Element get parent => null;
   Map<String, String> get attributes => const {};
   CSSClassSet get classes => new _FrozenCSSClassSet();
   Map<String, String> get dataAttributes => const {};
   CSSStyleDeclaration get style => new Element.tag('div').style;
   Future<CSSStyleDeclaration> get computedStyle =>
@@ skipping 105 matching lines @@
       "WebKit drop zone can't be set for document fragments.");
   }
 
   void set webkitRegionOverflow(String value) {
     throw new UnsupportedOperationException(
       "WebKit region overflow can't be set for document fragments.");
   }
 
 $!MEMBERS
 }