Apply automatic range checks to content enum types across IPC.

content/public/common/window_container_type.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_COMMON_WINDOW_CONTAINER_TYPE_H_
 #define CONTENT_PUBLIC_COMMON_WINDOW_CONTAINER_TYPE_H_
 
 namespace blink {
 
 struct WebWindowFeatures;
 
 }
 
 // "Container" types which can be requested via the window.open feature
 // string.
 enum WindowContainerType {
   // A window shown in popup or tab.
   WINDOW_CONTAINER_TYPE_NORMAL = 0,
 
   // A window run as a hidden "background" page.
   WINDOW_CONTAINER_TYPE_BACKGROUND,
 
   // A window run as a hidden "background" page that wishes to be started
   // upon browser launch and run beyond the lifetime of the pages that
   // reference it.
   WINDOW_CONTAINER_TYPE_PERSISTENT,
 
-  WINDOW_CONTAINER_TYPE_MAX_VALUE
+  WINDOW_CONTAINER_TYPE_MAX_VALUE = WINDOW_CONTAINER_TYPE_PERSISTENT,
 };
 
 // Conversion function:
 WindowContainerType WindowFeaturesToContainerType(
     const blink::WebWindowFeatures& window_features);
 
 #endif  // CONTENT_PUBLIC_COMMON_WINDOW_CONTAINER_TYPE_H_