Revert "Use browsers JSON.parse for parsing JSON."

sdk/lib/json/json.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.
 
 library dart.json;
 
 // JSON parsing and serialization.
 
 /**
  * Error thrown by JSON serialization if an object cannot be serialized.
@@ skipping 17 matching lines @@
     if (cause != null) {
       return "Calling toJson method on object failed.";
     } else {
       return "Object toJson method returns non-serializable value.";
     }
   }
 }
 
 
 /**
- * Parses [json] and builds the corresponding parsed JSON value.
+ * Parses [json] and build the corresponding parsed JSON value.
  *
  * Parsed JSON values are of the types [num], [String], [bool], [Null],
  * [List]s of parsed JSON values or [Map]s from [String] to parsed
  * JSON values.
  *
- * The optional [reviver] function, if provided, is called once for each object
- * or list property parsed. The arguments are the property name ([String]) or
- * list index ([int]), and the value is the parsed value.  The return value of
- * the reviver will be used as the value of that property instead of the parsed
- * value.  The top level value is passed to the reviver with the empty string as
- * a key.
+ * The optional [revivier] function, if provided, is called once for each
+ * object or list property parsed. The arguments are the property name
+ * ([String]) or list index ([int]), and the value is the parsed value.
+ * The return value of the revivier will be used as the value of that property
+ * instead the parsed value.
  *
  * Throws [FormatException] if the input is not valid JSON text.
  */
-external parse(String json, [reviver(var key, var value)]);
-
-_parse(String json, [reviver(var key, var value)]) {
+parse(String json, [reviver(var key, var value)]) {
   BuildJsonListener listener;
   if (reviver == null) {
     listener = new BuildJsonListener();
   } else {
     listener = new ReviverJsonListener(reviver);
   }
   new JsonParser(json, listener).parse();
   return listener.result;
 }
 
@@ skipping 732 matching lines @@
         first = false;
       });
       sb.add('}');
       seen.removeLast();
       return true;
     } else {
       return false;
     }
   }
 }