Rename File.readAsText to File.readAsString. There is no Text type in Dart

utils/apidoc/apidoc.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.
 
 /**
  * This generates the reference documentation for the core libraries that come
  * with dart. It is built on top of dartdoc, which is a general-purpose library
  * for generating docs from any Dart code. This library extends that to include
  * additional information and styling specific to our standard library.
  *
@@ skipping 67 matching lines @@
       doc.scriptDir.append('../../sdk/lib/_internal/dartdoc/static'),
       outputDir);
 
   // The apidoc-specific static content.
   final copiedApiDocStatic = doc.copyDirectory(
       doc.scriptDir.append('static'),
       outputDir);
 
   print('Parsing MDN data...');
   final mdnFile = new File.fromPath(doc.scriptDir.append('mdn/database.json'));
-  final mdn = JSON.parse(mdnFile.readAsTextSync());
+  final mdn = JSON.parse(mdnFile.readAsStringSync());
 
   print('Cross-referencing dart:html...');
   HtmlDiff.initialize(libPath);
   _diff = new HtmlDiff(printWarnings:false);
   _diff.run();
 
   // Process handwritten HTML documentation.
   print('Processing handwritten HTML documentation...');
   final htmldoc = new Htmldoc();
   htmldoc.includeApi = true;
@@ skipping 481 matching lines @@
    return '''
         <div class="mdn">
         $mdnComment
         <div class="mdn-note"><a href="$mdnUrl">from MDN</a></div>
         </div>
         ''';
   }
 
   String toString() => mdnComment;
 }