Update charted to 0.4.8 and roll

packages/csslib/lib/src/messages.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.src.messages;
 
 import 'package:logging/logging.dart' show Level;
 import 'package:source_span/source_span.dart';
 
 import 'options.dart';
@@ skipping 37 matching lines @@
 
   Message(this.level, this.message, {SourceSpan span, bool useColors: false})
       : this.span = span,
         this.useColors = useColors;
 
   String toString() {
     var output = new StringBuffer();
     bool colors = useColors && _ERROR_COLORS.containsKey(level);
     var levelColor = colors ? _ERROR_COLORS[level] : null;
     if (colors) output.write(levelColor);
-    output
-      ..write(_ERROR_LABEL[level])
-      ..write(' ');
+    output..write(_ERROR_LABEL[level])..write(' ');
     if (colors) output.write(NO_COLOR);
 
     if (span == null) {
       output.write(message);
     } else {
       output.write('on ');
       output.write(span.message(message, color: levelColor));
     }
 
     return output.toString();
@@ skipping 50 matching lines @@
   }
 
   /** Merge [newMessages] to this message lsit. */
   void mergeMessages(Messages newMessages) {
     messages.addAll(newMessages.messages);
     newMessages.messages
         .where((message) => message.level == Level.SEVERE || options.verbose)
         .forEach(printHandler);
   }
 }