add HideAndClose in preference to having Close sometimes magically defer

ui/views/widget/desktop_aura/desktop_root_window_host_x11.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/desktop_aura/desktop_root_window_host_x11.h"
 
 #include <X11/extensions/XInput2.h>
 #include <X11/Xatom.h>
 #include <X11/Xutil.h>
 
@@ skipping 318 matching lines @@
   if (sanitized_params.bounds.height() == 0)
     sanitized_params.bounds.set_height(100);
 
   InitX11Window(sanitized_params);
   return InitRootWindow(sanitized_params);
 }
 
 void DesktopRootWindowHostX11::InitFocus(aura::Window* window) {
 }
 
+bool DesktopRootWindowHostX11::SetCloseOnHideCompletion() {
+  return false;
+}
+
 void DesktopRootWindowHostX11::Close() {
   // TODO(erg): Might need to do additional hiding tasks here.
 
   if (!close_widget_factory_.HasWeakPtrs()) {
     // And we delay the close so that if we are called from an ATL callback,
     // we don't destroy the window before the callback returned (as the caller
     // may delete ourselves on destroy and the ATL callback would still
     // dereference us when the callback returns).
     MessageLoop::current()->PostTask(
         FROM_HERE,
@@ skipping 792 matching lines @@
 DesktopRootWindowHost* DesktopRootWindowHost::Create(
     internal::NativeWidgetDelegate* native_widget_delegate,
     DesktopNativeWidgetAura* desktop_native_widget_aura,
     const gfx::Rect& initial_bounds) {
   return new DesktopRootWindowHostX11(native_widget_delegate,
                                         desktop_native_widget_aura,
                                         initial_bounds);
 }
 
 }  // namespace views