Move dart:chrome to dart:_chrome.

tools/dom/src/chrome/custom_dart/app_window.AppWindow.contentWindow.dart

Index: tools/dom/src/chrome/custom_dart/app_window.AppWindow.contentWindow.dart
===================================================================
--- tools/dom/src/chrome/custom_dart/app_window.AppWindow.contentWindow.dart	(revision 27851)
+++ tools/dom/src/chrome/custom_dart/app_window.AppWindow.contentWindow.dart	(working copy)
@@ -1,8 +0,0 @@
-// Copyright (c) 2013, 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.
-
-// TODO(sashab, sra): Detect whether this is the current window, or an
-// external one, and return an appropriately-typed object
-WindowBase get contentWindow =>

[Emily Fortuna, 2013/09/24 23:29:17]

did these files get moved somewhere?

-  JS("Window", "#.contentWindow", this._jsObject);