Ensure settings returned from Content Settings providers are valid

components/content_settings/core/browser/content_settings_info.h

 // 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.
 
 #ifndef COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_INFO_H_
 #define COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_INFO_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 28 matching lines @@
   ~ContentSettingsInfo();
 
   const WebsiteSettingsInfo* website_settings_info() const {
     return website_settings_info_;
   }
   const std::vector<std::string>& whitelisted_schemes() const {
     return whitelisted_schemes_;
   }
 
   bool IsSettingValid(ContentSetting setting) const;
+  bool IsDefaultSettingValid(ContentSetting setting) const;
 
   IncognitoBehavior incognito_behavior() const { return incognito_behavior_; }
 
  private:
   const WebsiteSettingsInfo* website_settings_info_;
   const std::vector<std::string> whitelisted_schemes_;
   const std::set<ContentSetting> valid_settings_;
   const IncognitoBehavior incognito_behavior_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentSettingsInfo);
 };
 
 }  // namespace content_settings
 
 #endif  // COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_INFO_H_