Remove (Native)Widget::StackBelow().

ui/views/widget/widget.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 UI_VIEWS_WIDGET_WIDGET_H_
 #define UI_VIEWS_WIDGET_WIDGET_H_
 
 #include <map>
 #include <memory>
 #include <set>
@@ skipping 453 matching lines @@
                              MoveLoopEscapeBehavior escape_behavior);
 
   // Stops a previously started move loop. This is not immediate.
   void EndMoveLoop();
 
   // Places the widget in front of the specified widget in z-order.
   void StackAboveWidget(Widget* widget);
   void StackAbove(gfx::NativeView native_view);
   void StackAtTop();
 
-  // Places the widget below the specified NativeView.
-  void StackBelow(gfx::NativeView native_view);
-
   // Sets a shape on the widget. Passing a NULL |shape| reverts the widget to
   // be rectangular.
   void SetShape(std::unique_ptr<SkRegion> shape);
 
   // Hides the widget then closes it after a return to the message loop.
   virtual void Close();
 
   // TODO(beng): Move off public API.
   // Closes the widget immediately. Compare to |Close|. This will destroy the
   // window handle associated with this Widget, so should not be called from
@@ skipping 488 matching lines @@
   bool movement_disabled_;
 
   ScopedObserver<ui::NativeTheme, ui::NativeThemeObserver> observer_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(Widget);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_WIDGET_H_