[cros] check for updates in WebUI OOBE can be cancelled in dev builds.

chrome/browser/chromeos/login/views_update_screen_actor.cc

 // Copyright (c) 2011 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 "chrome/browser/chromeos/login/views_update_screen_actor.h"
 
 namespace {
 
 // Considering 10px shadow from each side.
 const int kUpdateScreenWidth = 580;
 const int kUpdateScreenHeight = 305;
 
 }  // namespace
 
 namespace chromeos {
 
 ViewsUpdateScreenActor::ViewsUpdateScreenActor(ViewScreenDelegate* delegate)
     : DefaultViewScreen<chromeos::UpdateView>(delegate,
                                               kUpdateScreenWidth,
-                                              kUpdateScreenHeight) {
+                                              kUpdateScreenHeight),
+      screen_(NULL) {
+}
+
+ViewsUpdateScreenActor::~ViewsUpdateScreenActor() {
+  if (screen_)
+    screen_->OnActorDestroyed(this);
+}
+
+void ViewsUpdateScreenActor::SetDelegate(UpdateScreenActor::Delegate* screen) {
+  screen_ = screen;
 }
 
 void ViewsUpdateScreenActor::PrepareToShow() {
   DefaultViewScreen<chromeos::UpdateView>::PrepareToShow();
 }
 
 void ViewsUpdateScreenActor::Show() {
   DefaultViewScreen<chromeos::UpdateView>::Show();
 }
 
@@ skipping 11 matching lines @@
 
 void ViewsUpdateScreenActor::ShowCurtain(bool enable) {
   view()->ShowCurtain(enable);
 }
 
 void ViewsUpdateScreenActor::ShowPreparingUpdatesInfo(bool visible) {
   view()->ShowPreparingUpdatesInfo(visible);
 }
 
 }  // namespace chromeos