pkg/csslib: remove unused vars and fields

test/nested_test.dart

 // Copyright (c) 2013, 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 nested_test;
 
 import 'package:unittest/unittest.dart';
 import 'testing.dart';
 
 List optionsCss = ['--no-colors', 'memory'];
@@ skipping 177 matching lines @@
 #header div a {
   height: 200px;
 }
 span {
   color: #1f1f1f;
 }''';
   compileAndValidate(input13, generated13);
 }
 
 void simpleNest() {
-  final errors = [];
   final input = '''
 div span { color: green; }
 #header {
   color: red;
   h1 {
     font-size: 26px;
     font-weight: bold;
   }
   p {
     font-size: 12px;
@@ skipping 23 matching lines @@
 #header p a {
   text-decoration: none;
 }
 div > span[attr="foo"] {
   color: #ff0;
 }''';
   compileAndValidate(input, generated);
 }
 
 void complexNest() {
-  final errors = [];
   final input = '''
 @font-face  { font-family: arial; }
 div { color: #f0f0f0; }
 #header + div {
   color: url(abc.png);
   *[attr="bar"] {
     font-size: 26px;
     font-weight: bold;
   }
   p~ul {
@@ skipping 380 matching lines @@
 main() {
   test('Selector and Nested Variations', selectorVariations);
   test('Simple nesting', simpleNest);
   test('Complex nesting', complexNest);
   test('@media nesting', mediaNesting);
   test('Simple &', simpleThis);
   test("Variations &", variationsThis);
   test('Complex &', complexThis);
   test('& with + selector', thisCombinator);
 }