fix a few more codegen issues:

lib/runtime/_types.js

 // Copyright (c) 2015, 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 library defines the representation of runtime types.
 */
 
 dart_library.library('dart_runtime/_types', null, /* Imports */[
 ], /* Lazy Imports */[
   'dart/core',
   'dart_runtime/_classes',
   'dart_runtime/_rtti'
 ], function(exports, core, classes, rtti) {
   'use strict';
 
   const getOwnPropertyNames = Object.getOwnPropertyNames;
 
   const assert = dart_utils.assert;
-  const copyProperties = dart_utils.copyProperties;
-  const safeGetOwnProperty = dart_utils.safeGetOwnProperty;
 
   /**
    * Types in dart are represented at runtime as follows.
    *   - Normal nominal types, produced from classes, are represented
    *     at runtime by the JS class of which they are an instance.
    *     If the type is the result of instantiating a generic class,
    *     then the "classes" module manages the association between the
    *     instantiated class and the original class declaration
    *     and the type arguments with which it was instantiated.  This 
    *     assocation can be queried via the "classes" module".
@@ skipping 26 matching lines @@
 
   class Void extends TypeRep {
     toString() { return "void"; }
   }
 
   let voidR = new Void();
   exports.void = voidR;
 
   class Bottom extends TypeRep {
     toString() { return "bottom"; }
-  };
+  }
   let bottomR = new Bottom();
   exports.bottom = bottomR;
 
   class JSObject extends TypeRep {
     toString() { return "NativeJavaScriptObject"; }
-  };
+  }
   let jsobjectR = new JSObject();
   exports.jsobject = jsobjectR;
 
   class AbstractFunctionType extends TypeRep {
     constructor() {
       super();
       this._stringValue = null;
     }
 
     toString() { return this.name; }
@@ skipping 455 matching lines @@
     let typeArgs = classes.getGenericArgs(type);
     if (!typeArgs) return true;
     for (let t of typeArgs) {
       if (t != core.Object && t != dynamicR) return false;
     }
     return true;
   }
   exports.isGroundType = isGroundType;
 
 });