Update bookmark suggestions in open NTPs when removing their visit dates

components/ntp_snippets/bookmarks/bookmark_suggestions_provider.cc

Index: components/ntp_snippets/bookmarks/bookmark_suggestions_provider.cc
diff --git a/components/ntp_snippets/bookmarks/bookmark_suggestions_provider.cc b/components/ntp_snippets/bookmarks/bookmark_suggestions_provider.cc
index eaea934043a9fc0f63e7163abc1a6f33587c7d2f..7e43abd335f02d5e5bbf5d688fa5b23443eb671c 100644
--- a/components/ntp_snippets/bookmarks/bookmark_suggestions_provider.cc
+++ b/components/ntp_snippets/bookmarks/bookmark_suggestions_provider.cc
@@ -193,6 +193,13 @@ void BookmarkSuggestionsProvider::ClearHistory(
   RemoveAllLastVisitDates(bookmark_model_);
   ClearDismissedSuggestionsForDebugging(provided_category_);
   FetchBookmarks();
+  // Temporarily enter an "explicitly disabled" state, so that any open UIs
+  // will clear the suggestions too.
+  if (category_status_ != CategoryStatus::CATEGORY_EXPLICITLY_DISABLED) {
+    CategoryStatus old_category_status = category_status_;
+    NotifyStatusChanged(CategoryStatus::CATEGORY_EXPLICITLY_DISABLED);
+    NotifyStatusChanged(old_category_status);
+  }
 }
 
 void BookmarkSuggestionsProvider::ClearCachedSuggestions(Category category) {