views: Finally get rid of the deprecated Menu2 API.

ui/views/controls/menu/menu_insertion_delegate.h

+// Copyright 2013 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 UI_VIEWS_CONTROLS_MENU_INSERTION_DELEGATE_H_
+#define UI_VIEWS_CONTROLS_MENU_INSERTION_DELEGATE_H_
+
+namespace views {
+
+class MenuInsertionDelegate {
+ public:
+  // Returns the index to insert items into the menu at.
+  virtual int GetInsertionIndex(HMENU native_menu) = 0;
+
+ protected:
+  virtual ~MenuInsertionDelegate() {}
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_CONTROLS_MENU_INSERTION_DELEGATE_H_