Fixing a bunch of dartc errors in dart:html tests.

tests/html/node_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 NodeTest;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_individual_config.dart';
 import 'dart:html';
 import 'dart:svg' as svg;
 
@@ skipping 23 matching lines @@
     expect(node.nodes[0], isText);
     expect(node.nodes[0].text, 'Foo');
     expect(node.nodes[1], isText);
     expect(node.nodes[1].text, 'Bar');
     expect(node.nodes[2], isComment);
   });
 
   test('remove', () {
     final node = makeNodeWithChildren();
     final subnode = node.nodes[1];
-    final out = subnode.remove();
-    expect(out, isNull);
+    subnode.remove();
     expect(node.nodes.length, 2);
     expect(node.nodes[0], isText);
     expect(node.nodes[1], isComment);
   });
 
   test('contains', () {
     final Node node = new Element.html("<div>Foo<span>Bar</span></div>");
     expect(node.contains(node.nodes.first), isTrue);
     expect(node.contains(node.nodes[1].nodes.first), isTrue);
     expect(node.contains(new Text('Foo')), isFalse);
@@ skipping 142 matching lines @@
     });
 
     test('getRange', () {
       var range = makeNodeList().getRange(1, 2);
       expect(range, isNodeList);
       expect(range[0], isBRElement);
       expect(range[1], isComment);
     });
   });
 }