Native wrappers should implement dart:html interfaces.

lib/dom/src/native_DOMImplementation.dart

 // 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.
 
 class _Utils {
   static List convertToList(List list) {
     // FIXME: [possible optimization]: do not copy the array if Dart_IsArray is fine w/ it.
     final length = list.length;
     List result = new List(length);
     result.copyFrom(list, 0, 0, length);
@@ skipping 14 matching lines @@
 
   static bool isMap(obj) => obj is Map;
 
   static Map createMap() => {};
 
   static makeNotImplementedException(String fileName, int lineNo) {
     return new UnsupportedOperationException('[info: $fileName:$lineNo]');
   }
 
   static window() native "Utils_window";
-  static SendPort spawnDomIsolateImpl(_DOMWindow window, String entryPoint) native "Utils_spawnDomIsolate";
+  static SendPort spawnDomIsolateImpl(Window window, String entryPoint) native "Utils_spawnDomIsolate";
 }
 
 Utils_print(String message) native "Utils_print";
 
 class _NPObject extends _DOMWrapperBase {
   _NPObject();
   static _NPObject retrieve(String key) native "NPObject_retrieve";
   property(String propertyName) native "NPObject_property";
   invoke(String methodName, [ObjectArray args = null]) native "NPObject_invoke";
 }
 
-class _DOMWindowCrossFrameDOMImpl extends _DOMWrapperBase implements _DOMWindow {
+class _DOMWindowCrossFrameDOMImpl extends _DOMWrapperBase implements Window {
   _DOMWindowCrossFrameDOMImpl();
 
   // Fields.
   History get history() native "DOMWindow_history_cross_frame_Getter";
   Location get location() native "DOMWindow_location_cross_frame_Getter";
   bool get closed() native "DOMWindow_closed_Getter";
   int get length() native "DOMWindow_length_Getter";
   DOMWindow get opener() native "DOMWindow_opener_Getter";
   DOMWindow get parent() native "DOMWindow_parent_Getter";
   DOMWindow get top() native "DOMWindow_top_Getter";
 
   // Methods.
   void focus() native "DOMWindow_focus_Callback";
   void blur() native "DOMWindow_blur_Callback";
   void close() native "DOMWindow_close_Callback";
   void postMessage(/*SerializedScriptValue*/ message, String targetOrigin, [List messagePorts]) native "DOMWindow_postMessage_Callback";
 
   // Implementation support.
   String get typeName() => "DOMWindow";
 }
 
-class _HistoryCrossFrameDOMImpl extends _DOMWrapperBase implements _History {
+class _HistoryCrossFrameDOMImpl extends _DOMWrapperBase implements History {
   _HistoryCrossFrameDOMImpl();
 
   // Methods.
   void back() native "History_back_Callback";
   void forward() native "History_forward_Callback";
   void go(int distance) native "History_go_Callback";
 
   // Implementation support.
   String get typeName() => "History";
 }
 
-class _LocationCrossFrameDOMImpl extends _DOMWrapperBase implements _Location {
+class _LocationCrossFrameDOMImpl extends _DOMWrapperBase implements Location {
   _LocationCrossFrameDOMImpl();
 
   // Fields.
   void set href(String) native "Location_href_Setter";
 
   // Implementation support.
   String get typeName() => "Location";
 }