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

chrome/browser/chromeos/login/update_screen.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/update_screen.h"
 
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/threading/thread_restrictions.h"
 #include "chrome/browser/chromeos/cros/cros_library.h"
@@ skipping 59 matching lines @@
 UpdateScreen::UpdateScreen(ScreenObserver* screen_observer,
                            UpdateScreenActor* actor)
     : WizardScreen(screen_observer),
       reboot_check_delay_(0),
       is_checking_for_update_(true),
       is_downloading_update_(false),
       is_ignore_update_deadlines_(false),
       is_shown_(false),
       ignore_idle_status_(true),
       actor_(actor) {
+  actor_->SetDelegate(this);
   GetInstanceSet().insert(this);
 }
 
 UpdateScreen::~UpdateScreen() {
   CrosLibrary::Get()->GetUpdateLibrary()->RemoveObserver(this);
   GetInstanceSet().erase(this);
+  if (actor_)
+    actor_->SetDelegate(NULL);
 }
 
 void UpdateScreen::UpdateStatusChanged(UpdateLibrary* library) {
   UpdateStatusOperation status = library->status().status;
   if (is_checking_for_update_ && status > UPDATE_STATUS_CHECKING_FOR_UPDATE) {
     is_checking_for_update_ = false;
   }
   if (ignore_idle_status_ && status > UPDATE_STATUS_IDLE) {
     ignore_idle_status_ = false;
   }
@@ skipping 87 matching lines @@
     ExitUpdate(REASON_UPDATE_INIT_FAILED);
   } else {
     CrosLibrary::Get()->GetUpdateLibrary()->AddObserver(this);
     VLOG(1) << "Initiate update check";
     CrosLibrary::Get()->GetUpdateLibrary()->RequestUpdateCheck(
         StartUpdateCallback, this);
   }
 }
 
 void UpdateScreen::CancelUpdate() {
+  VLOG(1) << "Forced update cancel";
   ExitUpdate(REASON_UPDATE_CANCELED);
 }
 
 void UpdateScreen::Show() {
   is_shown_ = true;
   actor_->Show();
   actor_->SetProgress(kBeforeUpdateCheckProgress);
 }
 
 void UpdateScreen::Hide() {
@@ skipping 83 matching lines @@
   if (!file_util::ReadFileToString(update_deadline_file_path, &deadline) ||
       deadline.empty()) {
     return false;
   }
 
   // TODO(dpolukhin): Analyze file content. Now we can just assume that
   // if the file exists and not empty, there is critical update.
   return true;
 }
 
+void UpdateScreen::OnActorDestroyed(UpdateScreenActor* actor) {
+  if (actor_ == actor)
+    actor_ = NULL;
+}
+
 }  // namespace chromeos