CameraPresenceNotifier observers removal supported.

chrome/browser/chromeos/login/managed/locally_managed_user_creation_screen.cc

 // Copyright (c) 2013 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/managed/locally_managed_user_creation_screen.h"
 
 #include "ash/desktop_background/desktop_background_controller.h"
 #include "ash/shell.h"
 #include "base/command_line.h"
 #include "base/rand_util.h"
@@ skipping 79 matching lines @@
       last_page_(kNameOfIntroScreen),
       image_decoder_(NULL),
       apply_photo_after_decoding_(false),
       selected_image_(0) {
   DCHECK(actor_);
   if (actor_)
     actor_->SetDelegate(this);
 }
 
 LocallyManagedUserCreationScreen::~LocallyManagedUserCreationScreen() {
+  CameraPresenceNotifier::GetInstance()->RemoveObserver(this);
   if (actor_)
     actor_->SetDelegate(NULL);
   if (image_decoder_.get())
     image_decoder_->set_delegate(NULL);
   NetworkPortalDetector::Get()->RemoveObserver(this);
 }
 
 void LocallyManagedUserCreationScreen::PrepareToShow() {
   if (actor_)
     actor_->PrepareToShow();
 }
 
 void LocallyManagedUserCreationScreen::Show() {
+  CameraPresenceNotifier::GetInstance()->AddObserver(this);
   if (actor_) {
     actor_->Show();
     // TODO(antrim) : temorary hack (until upcoming hackaton). Should be
     // removed once we have screens reworked.
     if (on_error_screen_)
       actor_->ShowPage(last_page_);
     else
       actor_->ShowIntroPage();
   }
 
@@ skipping 32 matching lines @@
       l10n_util::GetStringUTF16(
           IDS_CREATE_LOCALLY_MANAGED_USER_MANAGER_INCONSISTENT_STATE_BUTTON));
 }
 
 void LocallyManagedUserCreationScreen::ShowInitialScreen() {
   if (actor_)
     actor_->ShowIntroPage();
 }
 
 void LocallyManagedUserCreationScreen::Hide() {
+  CameraPresenceNotifier::GetInstance()->RemoveObserver(this);
   if (actor_)
     actor_->Hide();
   if (!on_error_screen_)
     NetworkPortalDetector::Get()->RemoveObserver(this);
 }
 
 std::string LocallyManagedUserCreationScreen::GetName() const {
   return WizardController::kLocallyManagedUserCreationScreenName;
 }
 
@@ skipping 379 matching lines @@
     selected_image_ = User::kExternalImageIndex;
   } else {
     NOTREACHED() << "Unexpected image type: " << image_type;
   }
 }
 
 void LocallyManagedUserCreationScreen::OnImageAccepted() {
 }
 
 }  // namespace chromeos