Don't generate dom_deprecated files at all.

lib/dom/templates/dom/dart2js/factoryprovider_WebKitCSSMatrix.darttemplate

Index: lib/dom/templates/dom/dart2js/factoryprovider_WebKitCSSMatrix.darttemplate
===================================================================
--- lib/dom/templates/dom/dart2js/factoryprovider_WebKitCSSMatrix.darttemplate	(revision 11969)
+++ lib/dom/templates/dom/dart2js/factoryprovider_WebKitCSSMatrix.darttemplate	(working copy)
@@ -1,11 +0,0 @@
-// 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 $FACTORYPROVIDER {
-  factory WebKitCSSMatrix([String cssValue = null]) native
-'''
-if (cssValue == null) return new WebKitCSSMatrix();
-return new WebKitCSSMatrix(cssValue);
-''';
-}