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

chrome/browser/chromeos/login/mock_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/mock_update_screen.h"
 
 namespace chromeos {
 
+using ::testing::AtLeast;
+using ::testing::NotNull;
+
 MockUpdateScreen::MockUpdateScreen(ScreenObserver* screen_observer,
                                    UpdateScreenActor* actor)
     : UpdateScreen(screen_observer, actor) {
 }
 
 MockUpdateScreen::~MockUpdateScreen() {
 }
 
-MockUpdateScreenActor::MockUpdateScreenActor() {
+MockUpdateScreenActor::MockUpdateScreenActor()
+    : screen_(NULL) {
+  EXPECT_CALL(*this, MockSetDelegate(NotNull())).Times(AtLeast(1));
 }
 
 MockUpdateScreenActor::~MockUpdateScreenActor() {
+  if (screen_)
+    screen_->OnActorDestroyed(this);
+}
+
+void MockUpdateScreenActor::SetDelegate(UpdateScreenActor::Delegate* screen) {
+  screen_ = screen;
+  MockSetDelegate(screen);
 }
 
 }  // namespace chromeos