Update charted to 0.4.8 and roll

packages/csslib/lib/src/tree_base.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;
 
 /**
  * The base type for all nodes in a CSS abstract syntax tree.
  */
 abstract class TreeNode {
   /** The source code this [TreeNode] represents. */
   final SourceSpan span;
 
   TreeNode(this.span);
 
   TreeNode clone();
 
   /** Classic double-dispatch visitor for implementing passes. */
-  void visit(VisitorBase visitor);
+  visit(VisitorBase visitor);
 
   /** A multiline string showing the node and its children. */
   String toDebugString() {
     var to = new TreeOutput();
     var tp = new _TreePrinter(to, true);
     this.visit(tp);
     return to.buf.toString();
   }
 }
 
@@ skipping 22 matching lines @@
 
   void heading(String name, [span]) {
     write(name);
     if (span != null) {
       buf.write('  (${span.message('')})');
     }
     buf.write('\n');
   }
 
   String toValue(value) {
-    if (value == null) return 'null';
-    else if (value is Identifier) return value.name;
-    else return value.toString();
+    if (value == null)
+      return 'null';
+    else if (value is Identifier)
+      return value.name;
+    else
+      return value.toString();
   }
 
   void writeNode(String label, TreeNode node) {
     write('${label}: ');
     depth += 1;
-    if (node != null) node.visit(printer);
-    else writeln('null');
+    if (node != null)
+      node.visit(printer);
+    else
+      writeln('null');
     depth -= 1;
   }
 
   void writeValue(String label, value) {
     var v = toValue(value);
     writeln('${label}: ${v}');
   }
 
   void writeNodeList(String label, List<TreeNode> list) {
     writeln('${label} [');
     if (list != null) {
       depth += 1;
       for (var node in list) {
         if (node != null) {
           node.visit(printer);
         } else {
           writeln('null');
         }
       }
       depth -= 1;
       writeln(']');
     }
   }
 
   String toString() => buf.toString();
 }