Ensure settings returned from Content Settings providers are valid

components/content_settings/core/browser/content_settings_registry.cc

 // Copyright 2015 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 "components/content_settings/core/browser/content_settings_registry.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/macros.h"
@@ skipping 232 matching lines @@
            ValidSettings(CONTENT_SETTING_ALLOW, CONTENT_SETTING_BLOCK,
                          CONTENT_SETTING_ASK),
            WebsiteSettingsInfo::REQUESTING_ORIGIN_AND_TOP_LEVEL_ORIGIN_SCOPE,
            WebsiteSettingsRegistry::PLATFORM_ANDROID |
                WebsiteSettingsRegistry::PLATFORM_CHROMEOS,
            ContentSettingsInfo::INHERIT_IF_LESS_PERMISSIVE);
 
   Register(CONTENT_SETTINGS_TYPE_DURABLE_STORAGE, "durable-storage",
            CONTENT_SETTING_ASK, WebsiteSettingsInfo::UNSYNCABLE,
            WhitelistedSchemes(),
-           ValidSettings(CONTENT_SETTING_ALLOW, CONTENT_SETTING_BLOCK),
+           ValidSettings(CONTENT_SETTING_ALLOW, CONTENT_SETTING_BLOCK,
+                         CONTENT_SETTING_ASK),
            WebsiteSettingsInfo::REQUESTING_ORIGIN_ONLY_SCOPE,
            WebsiteSettingsRegistry::DESKTOP |
                WebsiteSettingsRegistry::PLATFORM_ANDROID,
            ContentSettingsInfo::INHERIT_IF_LESS_PERMISSIVE);
 
   Register(CONTENT_SETTINGS_TYPE_BACKGROUND_SYNC, "background-sync",
            CONTENT_SETTING_ALLOW, WebsiteSettingsInfo::UNSYNCABLE,
            WhitelistedSchemes(),
            ValidSettings(CONTENT_SETTING_ALLOW, CONTENT_SETTING_BLOCK),
            WebsiteSettingsInfo::REQUESTING_ORIGIN_ONLY_SCOPE,
@@ skipping 71 matching lines @@
   if (!website_settings_info)
     return;
 
   DCHECK(!base::ContainsKey(content_settings_info_, type));
   content_settings_info_[type] = base::MakeUnique<ContentSettingsInfo>(
       website_settings_info, whitelisted_schemes, valid_settings,
       incognito_behavior);
 }
 
 }  // namespace content_settings