Convert WindowOpenDisposition to an enum class.

chrome/browser/ui/ash/chrome_shell_delegate.cc

 // Copyright (c) 2012 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/ui/ash/chrome_shell_delegate.h"
 
 #include <stddef.h>
 
 #include <limits>
 
@@ skipping 448 matching lines @@
 
   if (!browser) {
     browser = new Browser(Browser::CreateParams(profile));
     browser->window()->Show();
   }
 
   browser->window()->Activate();
 
   chrome::NavigateParams params(browser, GURL(kKeyboardShortcutHelpPageUrl),
                                 ui::PAGE_TRANSITION_AUTO_BOOKMARK);
-  params.disposition = SINGLETON_TAB;
+  params.disposition = WindowOpenDisposition::SINGLETON_TAB;
   chrome::Navigate(&params);
 }
 
 gfx::Image ChromeShellDelegate::GetDeprecatedAcceleratorImage() const {
   return ui::ResourceBundle::GetSharedInstance().GetImageNamed(
       IDR_BLUETOOTH_KEYBOARD);
 }
 
 void ChromeShellDelegate::ToggleTouchpad() {
   chromeos::system::InputDeviceSettings::Get()->ToggleTouchpad();
@@ skipping 68 matching lines @@
       NOTREACHED() << "Unexpected notification " << type;
   }
 }
 
 void ChromeShellDelegate::PlatformInit() {
   registrar_.Add(this, chrome::NOTIFICATION_LOGIN_USER_PROFILE_PREPARED,
                  content::NotificationService::AllSources());
   registrar_.Add(this, chrome::NOTIFICATION_SESSION_STARTED,
                  content::NotificationService::AllSources());
 }