Proof of concept of ignoring x-frame-options for sign-in webui.

chrome/common/url_constants.h

 // 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.
 
 // Contains constants for known URLs and portions thereof.
 
 #ifndef CHROME_COMMON_URL_CONSTANTS_H_
 #define CHROME_COMMON_URL_CONSTANTS_H_
 
 #include <string>
@@ skipping 470 matching lines @@
 
 // Pages under chrome-search.
 extern const char kChromeSearchLocalNtpHost[];
 extern const char kChromeSearchLocalNtpUrl[];
 extern const char kChromeSearchOnlineNtpHost[];
 
 // Host and URL for most visited iframes used on the Instant Extended NTP.
 extern const char kChromeSearchMostVisitedHost[];
 extern const char kChromeSearchMostVisitedUrl[];
 
+extern const char kChromeSigninHost[];
+
 #if defined(OS_CHROMEOS)
 extern const char kCrosScheme[];
 extern const char kDriveScheme[];
 #endif
 
 // Scheme for the DOM Distiller component.
 extern const char kDomDistillerScheme[];
 
 // "Learn more" URL for the Cloud Print section under Options.
 extern const char kCloudPrintLearnMoreURL[];
@@ skipping 12 matching lines @@
 extern const char kLanguageSettingsLearnMoreUrl[];
 
 #if defined(OS_MACOSX)
 // The URL for the 32-bit Mac deprecation help center article
 extern const char kMac32BitDeprecationURL[];
 #endif
 
 }  // namespace chrome
 
 #endif  // CHROME_COMMON_URL_CONSTANTS_H_