Converted CRWSessionController to use NavigationItems.

ios/web/public/navigation_item_list.h

+// Copyright 2017 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 IOS_WEB_PUBLIC_NAVIGATION_ITEM_LIST_H_
+#define IOS_WEB_PUBLIC_NAVIGATION_ITEM_LIST_H_
+
+#include <memory>
+#include <vector>
+
+namespace web {
+
+class NavigationItem;
+
+// Convenience typedef for a list of raw NavigationItem pointers.
+typedef std::vector<NavigationItem*> NavigationItemList;
+
+// Convenience typedef for a list of scoped NavigationItem pointers.
+typedef std::vector<std::unique_ptr<NavigationItem>> ScopedNavigationItemList;
+
+// Returns a NavigationItemList populated with raw pointer values from
+// |scoped_list|.
+NavigationItemList CreateUnscopedNavigationItemList(
+    const ScopedNavigationItemList& scoped_list);
+
+}  // namespace web
+
+#endif  // IOS_WEB_PUBLIC_NAVIGATION_ITEM_LIST_H_