Move runtime js files down to lib/runtime/dart

lib/runtime/dart/_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 */[
+dart_library.library('dart/_types', null, /* Imports */[
 ], /* Lazy Imports */[
   'dart/core',
-  'dart_runtime/_classes',
-  'dart_runtime/_rtti'
+  'dart/_classes',
+  'dart/_rtti'
 ], function(exports, core, classes, rtti) {
   'use strict';
 
   const getOwnPropertyNames = Object.getOwnPropertyNames;
 
   const assert = dart_utils.assert;
 
   /**
    * Types in dart are represented at runtime as follows.
    *   - Normal nominal types, produced from classes, are represented
@@ skipping 514 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;
 
 });