- Change "static final" to "static const" in the lib/ directory.

lib/compiler/implementation/source_map_builder.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('source_map_builder');
 
 #import('dart:json');
 
 #import('source_file.dart');
 
 class SourceMapBuilder {
-  static final int VLQ_BASE_SHIFT = 5;
-  static final int VLQ_BASE_MASK = (1 << 5) - 1;
-  static final int VLQ_CONTINUATION_BIT = 1 << 5;
-  static final int VLQ_CONTINUATION_MASK = 1 << 5;
-  static final String BASE64_DIGITS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmn'
+  static const int VLQ_BASE_SHIFT = 5;
+  static const int VLQ_BASE_MASK = (1 << 5) - 1;
+  static const int VLQ_CONTINUATION_BIT = 1 << 5;
+  static const int VLQ_CONTINUATION_MASK = 1 << 5;
+  static const String BASE64_DIGITS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmn'
                                       'opqrstuvwxyz0123456789+/';
 
   List<_Entry> entries;
 
   Map<String, int> sourceUrlMap;
   List<String> sourceUrlList;
   Map<String, int> sourceNameMap;
   List<String> sourceNameList;
 
   int previousTargetLine;
@@ skipping 122 matching lines @@
 }
 
 class _Entry {
   SourceFile sourceFile;
   int sourceOffset;
   String sourceName;
   int targetOffset;
   _Entry(this.sourceFile, this.sourceOffset, this.sourceName,
          this.targetOffset);
 }