Remove usage of dart:json.

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.
  *
  * Usage:
  *
  *     $ dart apidoc.dart [--out=<output directory>]
  */
 library apidoc;
 
 import 'dart:async';
+import 'dart:convert';
 import 'dart:io';
-import 'dart:json' as json;
 
 import 'html_diff.dart';
 
 // TODO(rnystrom): Use "package:" URL (#4968).
 import '../../sdk/lib/_internal/compiler/implementation/mirrors/mirrors.dart';
 import '../../sdk/lib/_internal/compiler/implementation/mirrors/mirrors_util.dart';
 import '../../sdk/lib/_internal/compiler/implementation/filenames.dart';
 import '../../sdk/lib/_internal/dartdoc/lib/dartdoc.dart';
 import '../../sdk/lib/_internal/libraries.dart';
 import 'package:path/path.dart' as path;
@@ skipping 75 matching lines @@
           '..', '..', 'sdk', 'lib', '_internal', 'dartdoc', 'static'),
       outputDir);
 
   // The apidoc-specific static content.
   final copiedApiDocStatic = copyDirectory(
       path.join(scriptDir, 'static'),
       outputDir);
 
   print('Parsing MDN data...');
   final mdnFile = new File(path.join(scriptDir, 'mdn', 'database.json'));
-  final mdn = json.parse(mdnFile.readAsStringSync());
+  final mdn = JSON.decode(mdnFile.readAsStringSync());
 
   print('Cross-referencing dart:html...');
   // TODO(amouravski): move HtmlDiff inside of the future chain below to re-use
   // the MirrorSystem already analyzed.
   _diff = new HtmlDiff(printWarnings:false);
   Future htmlDiff = _diff.run(currentDirectory.resolve(libPath));
 
   // TODO(johnniwinther): Libraries for the compilation seem to be more like
   // URIs. Perhaps Path should have a toURI() method.
   // Add all of the core libraries.
@@ skipping 346 matching lines @@
     var memberName = '$typeName.${member.simpleName}';
     if (member is MethodMirror && member.isConstructor) {
       final separator = member.constructorName == '' ? '' : '.';
       memberName = 'new $typeName$separator${member.constructorName}';
     }
 
     return a(memberUrl(member), memberName);
   }
 }