Fix crash during shutdown

athena/screen/screen_manager_impl.cc

 // Copyright 2014 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 "athena/screen/public/screen_manager.h"
 
 #include "athena/input/public/accelerator_manager.h"
 #include "athena/screen/screen_accelerator_handler.h"
 #include "athena/util/container_priorities.h"
 #include "athena/util/fill_layout_manager.h"
@@ skipping 222 matching lines @@
 }
 
 ScreenManagerImpl::~ScreenManagerImpl() {
   aura::client::SetScreenPositionClient(root_window_, NULL);
   aura::client::SetWindowTreeClient(root_window_, NULL);
   wm::FocusController* focus_controller =
       static_cast<wm::FocusController*>(focus_client_.get());
   root_window_->RemovePreTargetHandler(focus_controller);
   aura::client::SetActivationClient(root_window_, NULL);
   aura::client::SetFocusClient(root_window_, NULL);
+  aura::Window::Windows children = root_window_->children();
+  // Close All children:
+  for (aura::Window::Windows::iterator iter = children.begin();
+       iter != children.end();
+       ++iter) {
+    delete *iter;
+  }
   instance = NULL;
 }
 
 void ScreenManagerImpl::Init() {
   wm::FocusController* focus_controller =
       new wm::FocusController(new AthenaFocusRules());
 
   aura::client::SetFocusClient(root_window_, focus_controller);
   root_window_->AddPreTargetHandler(focus_controller);
   aura::client::SetActivationClient(root_window_, focus_controller);
@@ skipping 130 matching lines @@
 }
 
 // static
 void ScreenManager::Shutdown() {
   DCHECK(instance);
   delete instance;
   DCHECK(!instance);
 }
 
 }  // namespace athena