Make ContentSuggestionsService recognize new/removed categories

components/ntp_snippets/offline_pages/offline_page_suggestions_provider.cc

Index: components/ntp_snippets/offline_pages/offline_page_suggestions_provider.cc
diff --git a/components/ntp_snippets/offline_pages/offline_page_suggestions_provider.cc b/components/ntp_snippets/offline_pages/offline_page_suggestions_provider.cc
index eec605b00b188d6e1d32d9c7ec1f12e34821759a..d6cfe9ee00ee0a9321a9817949da3a3c43f4a89f 100644
--- a/components/ntp_snippets/offline_pages/offline_page_suggestions_provider.cc
+++ b/components/ntp_snippets/offline_pages/offline_page_suggestions_provider.cc
@@ -129,7 +129,7 @@ void OfflinePageSuggestionsProvider::OnOfflinePagesLoaded(
       break;
   }
 
-  observer_->OnNewSuggestions(provided_category_, std::move(suggestions));
+  observer_->OnNewSuggestions(this, provided_category_, std::move(suggestions));
 }
 
 void OfflinePageSuggestionsProvider::NotifyStatusChanged(
@@ -140,7 +140,7 @@ void OfflinePageSuggestionsProvider::NotifyStatusChanged(
 
   if (!observer_)
     return;
-  observer_->OnCategoryStatusChanged(provided_category_, new_status);
+  observer_->OnCategoryStatusChanged(this, provided_category_, new_status);
 }
 
 }  // namespace ntp_snippets