Cleanup references to the old DDC repo

pkg/dev_compiler/lib/js/legacy/dart_library.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 file defines the module loader for the dart runtime.
 */
 
 var dart_library =
   typeof module != "undefined" && module.exports || {};
 
@@ skipping 107 matching lines @@
   dart_library.start = start;
 
   let _bootstrapped = false;
   function bootstrap() {
     if (_bootstrapped) return;
     _bootstrapped = true;
 
     // Force import of core.
     var dart_sdk = import_('dart_sdk');
 
-    // TODO(vsm): DOM facades?
-    // See: https://github.com/dart-lang/dev_compiler/issues/173
+    // TODO(vsm): Move this to a shared location:
+    // https://github.com/dart-lang/sdk/issues/27605
     if (typeof NodeList !== "undefined") {
+      // TODO(vsm): Do we still need these?
       NodeList.prototype.get = function(i) { return this[i]; };
       NamedNodeMap.prototype.get = function(i) { return this[i]; };
       DOMTokenList.prototype.get = function(i) { return this[i]; };
       HTMLCollection.prototype.get = function(i) { return this[i]; };
+
       // Expose constructors for DOM types dart:html needs to assume are
       // available on window.
       if (typeof PannerNode == "undefined") {
         let audioContext;
         if (typeof AudioContext == "undefined" &&
             (typeof webkitAudioContext != "undefined")) {
           audioContext = new webkitAudioContext();
         } else {
           audioContext = new AudioContext();
           window.StereoPannerNode =
@@ skipping 25 matching lines @@
         window.SourceBufferList = new MediaSource().sourceBuffers.constructor;
       }
     }
 
     // This import is only needed for chrome debugging. We should provide an
     // option to compile without it.
     dart_sdk._debugger.registerDevtoolsFormatter();
   }
 
 })(dart_library);