Remove (Native)Widget::StackBelow().

ui/views/widget/widget.cc

 // 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.
 
 #include "ui/views/widget/widget.h"
 
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 535 matching lines @@
 }
 
 void Widget::StackAbove(gfx::NativeView native_view) {
   native_widget_->StackAbove(native_view);
 }
 
 void Widget::StackAtTop() {
   native_widget_->StackAtTop();
 }
 
-void Widget::StackBelow(gfx::NativeView native_view) {
-  native_widget_->StackBelow(native_view);
-}
-
 void Widget::SetShape(std::unique_ptr<SkRegion> shape) {
   native_widget_->SetShape(std::move(shape));
 }
 
 void Widget::Close() {
   if (widget_closed_) {
     // It appears we can hit this code path if you close a modal dialog then
     // close the last browser before the destructor is hit, which triggers
     // invoking Close again.
     return;
@@ skipping 928 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // internal::NativeWidgetPrivate, NativeWidget implementation:
 
 internal::NativeWidgetPrivate* NativeWidgetPrivate::AsNativeWidgetPrivate() {
   return this;
 }
 
 }  // namespace internal
 }  // namespace views