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

components/content_settings/core/browser/content_settings_registry.h

Index: components/content_settings/core/browser/content_settings_registry.h
diff --git a/components/content_settings/core/browser/content_settings_registry.h b/components/content_settings/core/browser/content_settings_registry.h
index bfa532fae656a8456e0796acef4f7a3decf938ad..0b9873e1cae609632930c2ff02a9b00f4ad5563f 100644
--- a/components/content_settings/core/browser/content_settings_registry.h
+++ b/components/content_settings/core/browser/content_settings_registry.h
@@ -64,6 +64,19 @@ class ContentSettingsRegistry {
                 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_;