Add non-host functionality to the previews blacklist

components/previews/core/previews_opt_out_store.h

Index: components/previews/core/previews_opt_out_store.h
diff --git a/components/previews/core/previews_opt_out_store.h b/components/previews/core/previews_opt_out_store.h
index 15aa73f3f9c104ddb354350f64471c207ed37687..a5629426db4c5aff8d4e7e5a6a4a312fc88a1fdd 100644
--- a/components/previews/core/previews_opt_out_store.h
+++ b/components/previews/core/previews_opt_out_store.h
@@ -22,21 +22,22 @@ namespace previews {
 
 enum class PreviewsType {
   NONE = 0,
   OFFLINE = 1,
   LAST = 2,
 };
 
 typedef std::unordered_map<std::string, std::unique_ptr<PreviewsBlackListItem>>
     BlackListItemMap;
 
-typedef base::Callback<void(std::unique_ptr<BlackListItemMap>)>
+typedef base::Callback<void(std::unique_ptr<BlackListItemMap>,
+                            std::unique_ptr<PreviewsBlackListItem>)>
     LoadBlackListCallback;
 
 // PreviewsOptOutStore keeps opt out information for the previews.
 // Ability to create multiple instances of the store as well as behavior of
 // asynchronous operations when the object is being destroyed, before such
 // operation finishes will depend on implementation. It is possible to issue
 // multiple asynchronous operations in parallel and maintain ordering.
 class PreviewsOptOutStore {
  public:
   virtual ~PreviewsOptOutStore() {}