Disable incognito if parental controls are enabled on android.

chrome/browser/prefs/incognito_mode_prefs.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.
 
 #ifndef CHROME_BROWSER_PREFS_INCOGNITO_MODE_PREFS_H_
 #define CHROME_BROWSER_PREFS_INCOGNITO_MODE_PREFS_H_
 
 #include "base/basictypes.h"
 
 class CommandLine;
@@ skipping 43 matching lines @@
   // Returns true if the browser should start in incognito mode.
   static bool ShouldLaunchIncognito(const CommandLine& command_line,
                                     const PrefService* prefs);
 
   // Returns true if |profile| can open a new Browser. This checks the incognito
   // availability policies and verifies if the |profile| type is allowed to
   // open new windows.
   static bool CanOpenBrowser(Profile* profile);
 
  private:
+  // Returns whether parental controls have been enabled on the platform, which
+  // if enabled will overrule the Availability as configured in prefs.
+  static bool ArePlatformParentalControlsEnabled();
+
   DISALLOW_IMPLICIT_CONSTRUCTORS(IncognitoModePrefs);
 };
 
 #endif  // CHROME_BROWSER_PREFS_INCOGNITO_MODE_PREFS_H_