Remove usage of dart:json.

utils/apidoc/mdn/extract.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.
 
 import "dart:collection";
+import 'dart:convert';
 import 'dart:html';
-import 'dart:json' as json;
 
 // Workaround for HTML lib missing feature.
 Range newRange() {
   return document.createRange();
 }
 
 // Temporary range object to optimize performance computing client rects
 // from text nodes.
 Range _tempRange;
 // Hacks because ASYNC measurement is annoying when just writing a script.
@@ skipping 321 matching lines @@
   return true;
 }
 
 bool isSkippable(Node n) {
   if (!isSkippableType(n)) return false;
   return n.text.trim().length == 0;
 }
 
 void onEnd() {
   // Hideous hack to send JSON back to JS.
-  String dbJson = json.stringify(dbEntry);
-  // workaround bug in json.parse.
+  String dbJson = JSON.encode(dbEntry);
+  // workaround bug in JSON.decode.
   dbJson = dbJson.replaceAll("ZDARTIUMDOESNTESCAPESLASHNJXXXX", "\\n");
 
   // Use postMessage to end the JSON to JavaScript. TODO(jacobr): use a simple
   // isolate based Dart-JS interop solution in the future.
   window.postMessage("START_DART_MESSAGE_UNIQUE_IDENTIFIER$dbJson", "*");
 }
 
 class SectionParseResult {
   final String html;
   final String url;
@@ skipping 946 matching lines @@
   onEnd();
 }
 
 void main() {
   window.on.load.add(documentLoaded);
 }
 
 void documentLoaded(event) {
   // Load the database of expected methods and properties with an HttpRequest.
   new HttpRequest.get('${window.location}.json', (req) {
-    data = json.parse(req.responseText);
+    data = JSON.decode(req.responseText);
     dbEntry = {'members': [], 'srcUrl': pageUrl};
     run();
   });
 }