- Update _blink library using dart:js instead of native keyword

tools/dom/src/native_DOMImplementation.dart

Index: tools/dom/src/native_DOMImplementation.dart
diff --git a/tools/dom/src/native_DOMImplementation.dart b/tools/dom/src/native_DOMImplementation.dart
index 34c032bb7377e674228c7e78276c1cbdbc2f9816..2a613c7f53d52ab71e905d4d5bb25bb070b37213 100644
--- a/tools/dom/src/native_DOMImplementation.dart
+++ b/tools/dom/src/native_DOMImplementation.dart
@@ -187,9 +187,9 @@ class _Utils {
     return element;
   }
 
-  // TODO(terry): Enable below for Dartium w/ interop and remove other static window().
-  // static window() => wrap_jso(_blink.Blink_Utils.window()['window']);
-  static window() => _blink.Blink_Utils.window();
+  static window() => wrap_jso(_blink.Blink_Utils.window()['window']);
+  // TODO(terry): Above enabled for Dartium w/ interop and remove below static window() for C++.
+  // static window() => _blink.Blink_Utils.window();
 
   static forwardingPrint(String message) => _blink.Blink_Utils.forwardingPrint(message);
   static void spawnDomHelper(Function f, int replyTo) =>