Supervised users: if history recording is off, allow incognito and deleting history

chrome/browser/supervised_user/supervised_user_constants.cc

 // Copyright 2014 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/supervised_user/supervised_user_constants.h"
 
 namespace supervised_users {
 
+const char kAllowDeletingBrowserHistory[] = "AllowDeletingBrowserHistory";
 const char kContentPackDefaultFilteringBehavior[] =
     "ContentPackDefaultFilteringBehavior";
 const char kContentPackManualBehaviorHosts[] = "ContentPackManualBehaviorHosts";
 const char kContentPackManualBehaviorURLs[] = "ContentPackManualBehaviorURLs";
 const char kForceSafeSearch[] = "ForceSafeSearch";
+const char kIncognitoModeAvailability[] = "IncognitoModeAvailability";
 const char kRecordHistory[] = "RecordHistory";
 const char kSigninAllowed[] = "SigninAllowed";
 const char kUserName[] = "UserName";
 
 const char kUserPasswordRecord[] = "UserPasswordRecord";
 
 const char kSupervisedUserPseudoEmail[] = "managed_user@localhost";
 
 const char kChromeAvatarIndex[] = "chrome-avatar-index";
 const char kChromeOSAvatarIndex[] = "chromeos-avatar-index";
 
 const char kChromeOSPasswordData[] = "chromeos-password-data";
 
 }  // namespace supervised_users