Revert "Removing ElementList (splitting out removing NodeList into a separate CL)."

tests/html/documentfragment_test.dart

 // 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.
 
 #library('DocumentFragmentTest');
 #import('../../pkg/unittest/unittest.dart');
 #import('../../pkg/unittest/html_config.dart');
 #import('dart:html');
 #source('util.dart');
 
@@ skipping 44 matching lines @@
   }
 
   group('constructors', () {
     test('0-argument makes an empty fragment', () {
       final fragment = new DocumentFragment();
       Expect.listEquals([], fragment.elements);
     });
 
     test('.html parses input as HTML', () {
       final fragment = new DocumentFragment.html('<a>foo</a>');
-      Expect.isTrue(fragment.elements[0] is AnchorElement);
+      Expect.isTrue(fragment.elements.first is AnchorElement);
     });
 
     // test('.svg parses input as SVG', () {
     //   final fragment = new DocumentFragment.svg('<a>foo</a>');
-    //   Expect.isTrue(fragment.elements[0] is SVGAElement);
+    //   Expect.isTrue(fragment.elements.first is SVGAElement);
     // });
 
     // TODO(nweiz): enable this once XML is ported.
     // test('.xml parses input as XML', () {
     //   final fragment = new DocumentFragment.xml('<a>foo</a>');
-    //   Expect.isTrue(fragment.elements[0] is XMLElement);
+    //   Expect.isTrue(fragment.elements.first is XMLElement);
     // });
   });
 
   test('Unsupported operations throw errors', () {
     var emptyFragment = new DocumentFragment();
     expectUnsupported(() => emptyFragment.attributes = {});
     expectUnsupported(() => emptyFragment.classes = []);
     expectUnsupported(() => emptyFragment.classes.add('foo'));
     expectUnsupported(() => emptyFragment.dataAttributes = {});
     expectUnsupported(() => emptyFragment.contentEditable = "true");
@@ skipping 64 matching lines @@
       Expect.listEquals(["A", "B", "I"], _nodeStrings(elements));
 
       Expect.equals("I", elements.removeLast().tagName);
       Expect.listEquals(["1", "A", "B", "2", "3"],
                         _nodeStrings(fragment.nodes));
       Expect.listEquals(["A", "B"], _nodeStrings(elements));
     });
 
     test('accessors are wrapped', () {
       init();
-      Expect.equals("A", elements[0].tagName);
+      Expect.equals("A", elements.first.tagName);
       Expect.listEquals(
           ["I"], _nodeStrings(elements.filter((e) => e.tagName == "I")));
       Expect.isTrue(elements.every((e) => e is Element));
       Expect.isTrue(elements.some((e) => e.tagName == "U"));
       Expect.isFalse(elements.isEmpty());
       Expect.equals(4, elements.length);
       Expect.equals("I", elements[2].tagName);
       Expect.equals("U", elements.last().tagName);
     });
 
@@ skipping 173 matching lines @@
   //   // assertConstError(() => fragment.classes.add('foo'));
   // });
 
   test('query searches the fragment', () {
     var fragment = new DocumentFragment.html(
       "<div class='foo'><a>foo</a><b>bar</b></div>");
     Expect.equals("A", fragment.query(".foo a").tagName);
     Expect.listEquals(["A", "B"], _nodeStrings(fragment.queryAll(".foo *")));
   });
 }