Prevent non-Incognito windows in the Guest session.

chrome/browser/chromeos/login/mock_authenticator.h

 // Copyright (c) 2010 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_CHROMEOS_LOGIN_MOCK_AUTHENTICATOR_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_MOCK_AUTHENTICATOR_H_
 #pragma once
 
 #include <string>
 
@@ skipping 140 matching lines @@
   }
 
   void SetBackgroundView(BackgroundView* background_view) {
     background_view_ = background_view;
   }
 
   BackgroundView* GetBackgroundView() {
     return background_view_;
   }
 
+  virtual std::string GetOffTheRecordCommandLine(
+      const GURL& start_url,
+      const CommandLine& base_command_line,
+      CommandLine* command_line) {
+    return std::string();
+  }
+
  private:
   std::string expected_username_;
   std::string expected_password_;
   std::string auth_token_;
   chromeos::BackgroundView* background_view_;
 
   DISALLOW_COPY_AND_ASSIGN(MockLoginUtils);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_MOCK_AUTHENTICATOR_H_