Converted CRWSessionController to use NavigationItems.

ios/web/public/navigation_item_list.mm

Index: ios/web/public/navigation_item_list.mm
diff --git a/ios/web/public/navigation_item_list.mm b/ios/web/public/navigation_item_list.mm
new file mode 100644
index 0000000000000000000000000000000000000000..7b1f4909788d8e180c6466dd27b1574556f0b8ac
--- /dev/null
+++ b/ios/web/public/navigation_item_list.mm
@@ -0,0 +1,17 @@
+// 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.
+
+#import "ios/web/public/navigation_item_list.h"
+
+namespace web {
+
+NavigationItemList CreateUnscopedNavigationItemList(
+    const ScopedNavigationItemList& scoped_list) {
+  NavigationItemList list;
+  for (size_t index = 0; index < scoped_list.size(); ++index)
+    list.push_back(scoped_list[index].get());
+  return list;
+}
+
+}  // namespace web