Update the string for gaia incognito header

chrome/browser/signin/signin_header_helper.h

 // Copyright 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.
 
 #ifndef CHROME_BROWSER_SIGNIN_SIGNIN_HEADER_HELPER_H_
 #define CHROME_BROWSER_SIGNIN_SIGNIN_HEADER_HELPER_H_
 
 namespace net {
 class URLRequest;
 }
@@ skipping 15 matching lines @@
   // Adding account disabled in the Android-for-EDU mode.
   PROFILE_MODE_ADD_ACCOUNT_DISABLED = 1 << 1
 };
 
 // The ServiceType specified by GAIA in the response header accompanying the 204
 // response. This indicates the action Chrome is supposed to lead the user to
 // perform.
 enum GAIAServiceType {
   GAIA_SERVICE_TYPE_NONE = 0,                 // No GAIA response header.
   GAIA_SERVICE_TYPE_SIGNOUT,                  // Logout all existing sessions.
-  GAIA_SERVICE_TYPE_SIGNOUTOPTIONS_INCOGNITO, // Open an incognito tab.
+  GAIA_SERVICE_TYPE_INCOGNITO,                // Open an incognito tab.
   GAIA_SERVICE_TYPE_ADDSESSION,               // Add a secondary account.
   GAIA_SERVICE_TYPE_REAUTH,                   // Re-authenticate an account.
   GAIA_SERVICE_TYPE_DEFAULT,                  // All other cases.
 };
 
 // Add X-Chrome-Connected header to all Gaia requests from a connected profile,
 // with the exception of requests from gaia webview. Must be called on IO
 // thread.
 void AppendMirrorRequestHeaderIfPossible(
     net::URLRequest* request,
     const GURL& redirect_url,
     ProfileIOData* io_data,
     int child_id,
     int route_id);
 
 // Looks for the X-Chrome-Manage-Accounts response header, and if found,
 // tries to show the avatar bubble in the browser identified by the
 // child/route id. Must be called on IO thread.
 void ProcessMirrorResponseHeaderIfExists(
     net::URLRequest* request,
     ProfileIOData* io_data,
     int child_id,
     int route_id);
 
 };  // namespace signin
 
 #endif  // CHROME_BROWSER_SIGNIN_SIGNIN_HEADER_HELPER_H_