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diff --git a/docshell/build/nsDocShellCID.h b/docshell/build/nsDocShellCID.h
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+++ b/docshell/build/nsDocShellCID.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsDocShellCID_h__
+#define nsDocShellCID_h__
+
+/**
+ * A contract that can be used to get a service that provides
+ * meta-information about nsIWebNavigation objects' capabilities.
+ * @implements nsIWebNavigationInfo
+ */
+#define NS_WEBNAVIGATION_INFO_CONTRACTID "@mozilla.org/webnavigation-info;1"
+
+/**
+ * Contract ID to obtain the IHistory interface.  This is a non-scriptable
+ * interface used to interact with history in an asynchronous manner.
+ */
+#define NS_IHISTORY_CONTRACTID "@mozilla.org/browser/history;1"
+
+/**
+ * An observer service topic that can be listened to to catch creation
+ * of content browsing areas (both toplevel ones and subframes).  The
+ * subject of the notification will be the nsIWebNavigation being
+ * created.  At this time the additional data wstring is not defined
+ * to be anything in particular.
+ */
+#define NS_WEBNAVIGATION_CREATE "webnavigation-create"
+
+/**
+ * An observer service topic that can be listened to to catch creation
+ * of chrome browsing areas (both toplevel ones and subframes).  The
+ * subject of the notification will be the nsIWebNavigation being
+ * created.  At this time the additional data wstring is not defined
+ * to be anything in particular.
+ */
+#define NS_CHROME_WEBNAVIGATION_CREATE "chrome-webnavigation-create"
+
+/**
+ * An observer service topic that can be listened to to catch destruction
+ * of content browsing areas (both toplevel ones and subframes).  The
+ * subject of the notification will be the nsIWebNavigation being
+ * destroyed.  At this time the additional data wstring is not defined
+ * to be anything in particular.
+ */
+#define NS_WEBNAVIGATION_DESTROY "webnavigation-destroy"
+
+/**
+ * An observer service topic that can be listened to to catch destruction
+ * of chrome browsing areas (both toplevel ones and subframes).  The
+ * subject of the notification will be the nsIWebNavigation being
+ * destroyed.  At this time the additional data wstring is not defined
+ * to be anything in particular.
+ */
+#define NS_CHROME_WEBNAVIGATION_DESTROY "chrome-webnavigation-destroy"
+
+#endif  // nsDocShellCID_h__