Make base64 decoding available in dart:crypto

pkg/webdriver/lib/webdriver.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.
 
 library webdriver;
 
 import 'dart:async';
+import 'dart:crypto';
 import 'dart:io';
 import 'dart:json' as json;
 import 'dart:uri';
 
-part 'src/base64decoder.dart';
-
 /**
  * WebDriver bindings for Dart.
  *
  * These bindings are based on the WebDriver JSON wire protocol spec
  * (http://code.google.com/p/selenium/wiki/JsonWireProtocol). Not
  * all of these commands are implemented yet by WebDriver itself.
  * Nontheless this is a complete implementation of the spec as the
  * unsupported commands may be supported in the future. Currently,
  * there are known issues with local and session storage, script
  * execution, and log access.
@@ skipping 632 matching lines @@
   }
 
   /**
    * Take a screenshot of the current page (PNG).
    *
    * Potential Errors: NoSuchWindow.
    */
   Future<List<int>> getScreenshot([fname]) {
     var completer = new Completer();
     return _get('screenshot', completer, (r, v) {
-      var image = Base64Decoder.decode(v);
+      var image = CryptoUtils.base64StringToBytes(v);
       if (fname != null) {
         writeBytesToFile(fname, image);
       }
       completer.complete(image);
     });
   }
 
   /**
    * List all available IME (Input Method Editor) engines on the machine.
    * To use an engine, it has to be present in this list.
@@ skipping 765 matching lines @@
    *
    * 'timestamp' (int) - The timestamp of the entry.
    * 'level' (String) - The log level of the entry, for example, "INFO".
    * 'message' (String) - The log message.
    *
    * This works with Firefox but Chrome returns a 500 response due to a 
    * bad cast.
    */
   Future<List<Map>> getLogs(String type) => _post('log', { 'type': type });
 }