Generate all runtime files from dart.

tool/input_sdk/private/js_rti.dart

 // Copyright (c) 2013, 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.
 
 part of dart._js_helper;
 
 // TODO(leafp): Maybe get rid of this?  Currently used by the interceptors
 // library, but that should probably be culled as well.
 Type getRuntimeType(var object) =>
     JS('Type|null', 'dart.realRuntimeType(#)', object);
 
 /// Returns the property [index] of the JavaScript array [array].
 getIndex(var array, int index) {
-  assert(isJsArray(array));
+  assert_(isJsArray(array));
   return JS('var', r'#[#]', array, index);
 }
 
 /// Returns the length of the JavaScript array [array].
 int getLength(var array) {
-  assert(isJsArray(array));
+  assert_(isJsArray(array));
   return JS('int', r'#.length', array);
 }
 
 /// Returns whether [value] is a JavaScript array.
 bool isJsArray(var value) {
   return value is JSArray;
-}
+}