Add desktop UI for the subresource filter content setting.

components/subresource_filter/core/browser/subresource_filter_features.h

Index: components/subresource_filter/core/browser/subresource_filter_features.h
diff --git a/components/subresource_filter/core/browser/subresource_filter_features.h b/components/subresource_filter/core/browser/subresource_filter_features.h
index 86b56aae34e419b7ab8d1eeaf8f264eebc82623f..3aeca9f988c3b916488db4adf6fa2224d8ce90b6 100644
--- a/components/subresource_filter/core/browser/subresource_filter_features.h
+++ b/components/subresource_filter/core/browser/subresource_filter_features.h
@@ -15,6 +15,10 @@ namespace subresource_filter {
 // The master toggle to enable/disable the Safe Browsing Subresource Filter.
 extern const base::Feature kSafeBrowsingSubresourceFilter;
 
+// Enables and disables the appearance of the content setting corresponding to
+// the Safe Browsing Subresource Feature in the UI.
+extern const base::Feature kSafeBrowsingSubresourceFilterContentSetting;
+
 // Name/values of the variation parameter controlling maximum activation level.
 extern const char kActivationLevelParameterName[];
 extern const char kActivationLevelDryRun[];