update to polymer js 0.5.1

pkg/polymer/lib/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.
 
 /// Common logic to make it easy to run the polymer linter and deploy tool.
 ///
 /// The functions in this library are designed to make it easier to create
 /// `build.dart` files. A `build.dart` file is a Dart script that can be invoked
 /// from the command line, but that can also invoked automatically by the Dart
 /// Editor whenever a file in your project changes or when selecting some menu
@@ skipping 279 matching lines @@
         defaultsTo: 'out')
     ..addFlag('js', help:
         'deploy replaces *.dart scripts with *.dart.js. This flag \n'
         'leaves "packages/browser/dart.js" to do the replacement at runtime.',
         defaultsTo: true)
     ..addFlag('csp', help:
         'extracts inlined JavaScript code to comply with \n'
         'Content Security Policy restrictions.')
     ..addFlag('debug', help:
         'run in debug mode. For example, use the debug polyfill \n'
-        'web_components/platform.concat.js instead of the minified one.\n',
+        'web_components/webcomponents.js instead of the minified one.\n',
         defaultsTo: false)
     ..addFlag('help', abbr: 'h',
         negatable: false, help: 'Displays this help and exit.');
 
   showUsage() {
     print('Usage: dart build.dart [options]');
     print('\nThese are valid options expected by build.dart:');
     print(parser.getUsage());
   }
 
@@ skipping 35 matching lines @@
     var polymer = t['polymer'];
     if (polymer == null || polymer is! Map) return;
 
     var parsedEntryPoints = readFileList(polymer['entry_points']);
     if (parsedEntryPoints == null) return;
 
     entryPoints.addAll(parsedEntryPoints);
   });
   return entryPoints.isEmpty ? null : entryPoints;
 }