Removed fixed dependencies

packages/csslib/lib/src/tree.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.
 
 part of csslib.visitor;
 
 /////////////////////////////////////////////////////////////////////////
 // CSS specific types:
 /////////////////////////////////////////////////////////////////////////
 
@@ skipping 620 matching lines @@
       cloneExpressions.add(expr.clone());
     }
     return new MediaQuery(_mediaUnary, _mediaType, cloneExpressions, span);
   }
 
   visit(VisitorBase visitor) => visitor.visitMediaQuery(this);
 }
 
 class MediaDirective extends Directive {
   final List<MediaQuery> mediaQueries;
-  final List<RuleSet> rulesets;
+  final List<TreeNode> rules;
 
-  MediaDirective(this.mediaQueries, this.rulesets, SourceSpan span)
+  MediaDirective(this.mediaQueries, this.rules, SourceSpan span)
       : super(span);
 
   MediaDirective clone() {
     var cloneQueries = <MediaQuery>[];
     for (var mediaQuery in mediaQueries) {
       cloneQueries.add(mediaQuery.clone());
     }
-    var cloneRulesets = <RuleSet>[];
-    for (var ruleset in rulesets) {
-      cloneRulesets.add(ruleset.clone());
+    var cloneRules = <TreeNode>[];
+    for (var rule in rules) {
+      cloneRules.add(rule.clone());
     }
-    return new MediaDirective(cloneQueries, cloneRulesets, span);
+    return new MediaDirective(cloneQueries, cloneRules, span);
   }
 
   visit(VisitorBase visitor) => visitor.visitMediaDirective(this);
 }
 
 class HostDirective extends Directive {
-  final List<RuleSet> rulesets;
+  final List<TreeNode> rules;
 
-  HostDirective(this.rulesets, SourceSpan span) : super(span);
+  HostDirective(this.rules, SourceSpan span) : super(span);
 
   HostDirective clone() {
-    var cloneRulesets = <RuleSet>[];
-    for (var ruleset in rulesets) {
-      cloneRulesets.add(ruleset.clone());
+    var cloneRules = <TreeNode>[];
+    for (var rule in rules) {
+      cloneRules.add(rule.clone());
     }
-    return new HostDirective(cloneRulesets, span);
+    return new HostDirective(cloneRules, span);
   }
 
   visit(VisitorBase visitor) => visitor.visitHostDirective(this);
 }
 
 class PageDirective extends Directive {
   final String _ident;
   final String _pseudoPage;
   final List<DeclarationGroup> _declsMargin;
 
@@ skipping 82 matching lines @@
 
   FontFaceDirective(this._declarations, SourceSpan span) : super(span);
 
   FontFaceDirective clone() =>
       new FontFaceDirective(_declarations.clone(), span);
   visit(VisitorBase visitor) => visitor.visitFontFaceDirective(this);
 }
 
 class StyletDirective extends Directive {
   final String dartClassName;
-  final List<RuleSet> rulesets;
+  final List<TreeNode> rules;
 
-  StyletDirective(this.dartClassName, this.rulesets, SourceSpan span)
+  StyletDirective(this.dartClassName, this.rules, SourceSpan span)
       : super(span);
 
   bool get isBuiltIn => false;
   bool get isExtension => true;
 
   StyletDirective clone() {
-    var cloneRulesets = <RuleSet>[];
-    for (var ruleset in rulesets) {
-      cloneRulesets.add(ruleset.clone());
+    var cloneRules = <TreeNode>[];
+    for (var rule in rules) {
+      cloneRules.add(rule.clone());
     }
-    return new StyletDirective(dartClassName, cloneRulesets, span);
+    return new StyletDirective(dartClassName, cloneRules, span);
   }
 
   visit(VisitorBase visitor) => visitor.visitStyletDirective(this);
 }
 
 class NamespaceDirective extends Directive {
   /** Namespace prefix. */
   final String _prefix;
 
   /** URI associated with this namespace. */
@@ skipping 785 matching lines @@
 
   PaddingExpression._merge(
       PaddingExpression x, PaddingExpression y, SourceSpan span)
       : super(DartStyleExpression.paddingStyle, span,
             new BoxEdge.merge(x.box, y.box));
 
   PaddingExpression clone() => new PaddingExpression(span,
       top: box.top, right: box.right, bottom: box.bottom, left: box.left);
   visit(VisitorBase visitor) => visitor.visitPaddingExpression(this);
 }