Remove the shared js_isolate_impl and the current js/dart interop implementation.

lib/dom/templates/html/dartium/html_dartium.darttemplate

 // Copyright (c) 2012, 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.
 
 // DO NOT EDIT
 // Auto-generated dart:html library.
 
 #library("dart:html");
 
 #import("dart:isolate");
 #import("dart:json");
 #import("dart:nativewrappers");
 
 $!GENERATED_DART_FILES
 
 #source('$AUXILIARY_DIR/EventListener.dart');
 #source('$AUXILIARY_DIR/KeyLocation.dart');
 #source('$AUXILIARY_DIR/KeyName.dart');
 #source('$AUXILIARY_DIR/ReadyState.dart');
 #source('$AUXILIARY_DIR/Timer.dart');
 #source('$AUXILIARY_DIR/_Collections.dart');
 #source('$AUXILIARY_DIR/_HttpRequestUtils.dart');
 #source('$AUXILIARY_DIR/../../html/src/shared_FactoryProviders.dart');
 #source('$AUXILIARY_DIR/../../html/src/dartium_FactoryProviders.dart');
-#source('$AUXILIARY_DIR/../../html/src/Isolates.dart');
 #source('$AUXILIARY_DIR/../../html/src/Measurement.dart');
 #source('$AUXILIARY_DIR/../../html/src/Device.dart');
 #source('$AUXILIARY_DIR/../../html/src/_Testing.dart');
 #source('$AUXILIARY_DIR/_ListIterators.dart');
 #source('$AUXILIARY_DIR/_Lists.dart');
-#source('$AUXILIARY_DIR/../../js_isolate_impl/isolate.dart');
 
 #source('$AUXILIARY_DIR/native_DOMPublic.dart');
 #source('$AUXILIARY_DIR/native_DOMImplementation.dart');
 
 Window __window;
 
 Window get window() {
   if (__window !== null) {
     return __window;
   }
@@ skipping 35 matching lines @@
       _callPortLastResult = JSON.parse(event.data);
     }, false);
     _callPortInitialized = true;
   }
   assert(_callPortLastResult == null);
   _dispatchEvent('js-sync-message', {'id': id, 'message': message});
   var result = _callPortLastResult;
   _callPortLastResult = null;
   return result;
 }