Allow load of the chrome://chrome-signin in incognito profile

chrome/browser/ui/webui/chrome_web_ui_controller_factory.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/webui/chrome_web_ui_controller_factory.h"
 
 #include <stddef.h>
 
 #include <vector>
 
@@ skipping 520 matching lines @@
       return nullptr;
     return &NewWebUI<DevToolsUI>;
   }
   // chrome://inspect isn't supported on Android nor iOS. Page debugging is
   // handled by a remote devtools on the host machine, and other elements, i.e.
   // extensions aren't supported.
   if (url.host_piece() == chrome::kChromeUIInspectHost)
     return &NewWebUI<InspectUI>;
 #endif
 #if !defined(OS_CHROMEOS) && !defined(OS_ANDROID)
-  if (url.host_piece() == chrome::kChromeUIChromeSigninHost &&
-      !profile->IsOffTheRecord())
+  if (url.host_piece() == chrome::kChromeUIChromeSigninHost)
     return &NewWebUI<InlineLoginUI>;
   if (url.host_piece() == chrome::kChromeUIMdUserManagerHost)
     return &NewWebUI<MDUserManagerUI>;
   if (url.host_piece() == chrome::kChromeUISigninErrorHost &&
       !profile->IsOffTheRecord())
     return &NewWebUI<SigninErrorUI>;
   if (url.host_piece() == chrome::kChromeUISyncConfirmationHost &&
       !profile->IsOffTheRecord())
     return &NewWebUI<SyncConfirmationUI>;
   if (url.host_piece() == chrome::kChromeUISigninEmailConfirmationHost &&
@@ skipping 275 matching lines @@
 #endif
 
   // Android doesn't use the plugins pages.
   if (page_url.host_piece() == chrome::kChromeUIPluginsHost)
     return PluginsUI::GetFaviconResourceBytes(scale_factor);
 
 #endif
 
   return NULL;
 }