- Change "static final" to "static const" in the

utils/css/generate.dart

 // Copyright (c) 2011, 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.
 
 class Generate {
 
   // Build up list of all known class selectors in all CSS files.
   static List<String> computeClassSelectors(RuleSet ruleset, classes) {
     for (final selector in ruleset.selectorGroup.selectors) {
       var selSeqs = selector.simpleSelectorSequences;
@@ skipping 22 matching lines @@
         '// Do not edit.\n\n');
 
     // Emit class for any @stylet directive.
     for (final production in stylesheet._topLevels) {
       if (production is Directive) {
         if (production is StyletDirective) {
           // TODO(terry): Need safer mechanism for stylets in different files
           //              and stylets with colliding names.
           buff.add('class ${production.dartClassName} {\n');
           buff.add('  // selector, properties<propertyName, value>\n');
-          buff.add('  static final selectors = const {\n');
+          buff.add('  static const selectors = const {\n');
 
           for (final ruleset in production.rulesets) {
             for (final selector in ruleset.selectorGroup.selectors) {
               var selSeq = selector.simpleSelectorSquences;
               if (selSeq.length == 1) {
                 buff.add('    \'${selSeq.toString()}\' : const {\n');
               }
             }
 
             for (final decl in ruleset.declarationGroup.declarations) {
@@ skipping 15 matching lines @@
         knownClasses = computeClassSelectors(production, knownClasses);
       }
     }
 
     // Generate all known classes encountered in all processed CSS files.
     StringBuffer classSelectors = new StringBuffer(
       'class CSS {\n' +
       '  // CSS class selectors:\n');
     for (final className in knownClasses) {
       String classAsDart = className.replaceAll('-', '_').toUpperCase();
-      classSelectors.add('  static final String ${classAsDart} = ' +
+      classSelectors.add('  static const String ${classAsDart} = ' +
           '\'${className}\';\n');
     }
     classSelectors.add('}\n');            // End of class selectors.
     buff.add(classSelectors.toString());
 
     // Write Dart file.
     String outFile = '${outPath}CSS.dart';
     files.writeString(outFile, buff.toString());
 
     return outFile;
   }
 }