Removed fixed dependencies

packages/csslib/lib/visitor.dart

 // 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.
 
 library csslib.visitor;
 
 import 'package:source_span/source_span.dart';
 import 'parser.dart';
 
 part 'src/css_printer.dart';
@@ skipping 172 matching lines @@
 
   visitSupportsDisjunction(SupportsDisjunction node) {
     _visitNodeList(node.conditions);
   }
 
   visitViewportDirective(ViewportDirective node) {
     node.declarations.visit(this);
   }
 
   visitMediaDirective(MediaDirective node) {
-    for (var mediaQuery in node.mediaQueries) {
-      visitMediaQuery(mediaQuery);
-    }
-    for (var ruleset in node.rulesets) {
-      visitRuleSet(ruleset);
-    }
+    _visitNodeList(node.mediaQueries);
+    _visitNodeList(node.rules);
   }
 
   visitHostDirective(HostDirective node) {
-    for (var ruleset in node.rulesets) {
-      visitRuleSet(ruleset);
-    }
+    _visitNodeList(node.rules);
   }
 
   visitPageDirective(PageDirective node) {
     for (var declGroup in node._declsMargin) {
       if (declGroup is MarginGroup) {
         visitMarginGroup(declGroup);
       } else {
         visitDeclarationGroup(declGroup);
       }
     }
@@ skipping 15 matching lines @@
   visitKeyFrameBlock(KeyFrameBlock node) {
     visitExpressions(node._blockSelectors);
     visitDeclarationGroup(node._declarations);
   }
 
   visitFontFaceDirective(FontFaceDirective node) {
     visitDeclarationGroup(node._declarations);
   }
 
   visitStyletDirective(StyletDirective node) {
-    _visitNodeList(node.rulesets);
+    _visitNodeList(node.rules);
   }
 
   visitNamespaceDirective(NamespaceDirective node) {}
 
   visitVarDefinitionDirective(VarDefinitionDirective node) {
     visitVarDefinition(node.def);
   }
 
   visitMixinRulesetDirective(MixinRulesetDirective node) {
     _visitNodeList(node.rulesets);
@@ skipping 237 matching lines @@
   visitPaddingExpression(PaddingExpression node) {
     // TODO(terry): TBD
     throw new UnimplementedError();
   }
 
   visitWidthExpression(WidthExpression node) {
     // TODO(terry): TBD
     throw new UnimplementedError();
   }
 }