Remove RTT.derivedTypes and all generated initializations thereof.

compiler/lib/implementation/rtt.js

 // 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.
 
 // The following methods are used to handle type information
 //
 
 /** 
  * @constructor
  * @param {string} classkey
@@ skipping 15 matching lines @@
   this.implementedTypes[classkey] = this;
   // Add Object
   if (!functionType && classkey != $cls('Object')) {
     this.implementedTypes[$cls('Object')] = RTT.objectType;
   }
 }
 
 /** @type {Object.<string, Object>} */
 RTT.types = {};
 
-/** @type {Array.<RTT>} */
-RTT.prototype.derivedTypes = [];
-
 /** @return {string} */
 RTT.prototype.toString = function() { return this.typeKey; }
 
 /**
  * @param {*} value 
  * @return {boolean} Whether this type is implemented by the value
  */
 RTT.prototype.implementedBy = function(value){ 
   return (value == null) ? RTT.nullInstanceOf(this) :
       this.functionType ? this.implementedByTypeFunc(value) :
@@ skipping 386 matching lines @@
   return typeof o == 'number';
 }
 
 /**
  * @param {*} o
  * @return {boolean}
  */
 function $isString(o) {
   return typeof o == 'string';
 }