Only Register() desktop-only content settings types on desktop platforms

components/content_settings/core/browser/content_settings_registry.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_REGISTRY_H_
 #define COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_REGISTRY_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 46 matching lines @@
   // value (see the ContentSetting enum).
   void Register(ContentSettingsType type,
                 const std::string& name,
                 ContentSetting initial_default_value,
                 WebsiteSettingsInfo::SyncStatus sync_status,
                 const std::vector<std::string>& whitelisted_schemes,
                 const std::set<ContentSetting>& valid_settings,
                 WebsiteSettingsInfo::ScopingType scoping_type,
                 ContentSettingsInfo::IncognitoBehavior incognito_behavior);
 
+  // Register a content setting that is only used on desktop platforms. It won't
+  // be registered on other platforms meaning that type information won't be
+  // available, a pref won't be registered, etc.
+  void RegisterDesktop(
+      ContentSettingsType type,
+      const std::string& name,
+      ContentSetting initial_default_value,
+      WebsiteSettingsInfo::SyncStatus sync_status,
+      const std::vector<std::string>& whitelisted_schemes,
+      const std::set<ContentSetting>& valid_settings,
+      WebsiteSettingsInfo::ScopingType scoping_type,
+      ContentSettingsInfo::IncognitoBehavior incognito_behavior);
+
   Map content_settings_info_;
   WebsiteSettingsRegistry* website_settings_registry_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentSettingsRegistry);
 };
 
 }  // namespace content_settings
 
 #endif  // COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_REGISTRY_H_