pkg/csslib: fixed analysis error, more cleanup

pkg/csslib/lib/src/tree_printer.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.
 
 part of csslib.visitor;
 
 // TODO(terry): Enable class for debug only; when conditional imports enabled.
 
 /** Helper function to dump the CSS AST. */
 String treeToDebugString(StyleSheet styleSheet, [bool useSpan = false]) {
@@ skipping 111 matching lines @@
     super.visitKeyFrameBlock(node);
     output.depth--;
   }
 
   void visitFontFaceDirective(FontFaceDirective node) {
     // TODO(terry): To Be Implemented
   }
 
   void visitStyletDirective(StyletDirective node) {
     heading('StyletDirective', node);
-    output.writeValue('dartClassName', node._dartClassName);
+    output.writeValue('dartClassName', node.dartClassName);
     output.depth++;
-    output.writeNodeList('rulesets', node._rulesets);
+    output.writeNodeList('rulesets', node.rulesets);
     output.depth--;
   }
 
   void visitNamespaceDirective(NamespaceDirective node) {
     heading('NamespaceDirective', node);
     output.depth++;
     output.writeValue('prefix', node._prefix);
     output.writeValue('uri', node._uri);
     output.depth--;
   }
@@ skipping 48 matching lines @@
   void visitRuleSet(RuleSet node) {
     heading('Ruleset', node);
     output.depth++;
     super.visitRuleSet(node);
     output.depth--;
   }
 
   void visitDeclarationGroup(DeclarationGroup node) {
     heading('DeclarationGroup', node);
     output.depth++;
-    output.writeNodeList('declarations', node._declarations);
+    output.writeNodeList('declarations', node.declarations);
     output.depth--;
   }
 
   void visitMarginGroup(MarginGroup node) {
     heading('MarginGroup', node);
     output.depth++;
     output.writeValue('@directive', node.margin_sym);
-    output.writeNodeList('declarations', node._declarations);
+    output.writeNodeList('declarations', node.declarations);
     output.depth--;
   }
 
   void visitDeclaration(Declaration node) {
     heading('Declaration', node);
     output.depth++;
     if (node.isIE7) output.write('IE7 property');
     output.write('property');
     super.visitDeclaration(node);
     output.writeNode('expression', node._expression);
@@ skipping 327 matching lines @@
   }
 
   void visitPaddingExpression(PaddingExpression node) {
     heading('Dart Style PaddingExpression', node);
   }
 
   void visitWidthExpression(WidthExpression node) {
     heading('Dart Style WidthExpression', node);
   }
 }