Implement ClearHistory for all ntp_snippets providers

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 e990e6a047d58db5574260ac4a4237d1e71a620f..eaea934043a9fc0f63e7163abc1a6f33587c7d2f 100644
--- a/components/ntp_snippets/bookmarks/bookmark_suggestions_provider.cc
+++ b/components/ntp_snippets/bookmarks/bookmark_suggestions_provider.cc
@@ -188,7 +188,11 @@ void BookmarkSuggestionsProvider::ClearHistory(
     base::Time begin,
     base::Time end,
     const base::Callback<bool(const GURL& url)>& filter) {
-  // TODO(vitaliii): Implement. See crbug.com/641321.
+  // TODO(vitaliii): Do not remove all dates, but only the ones matched by the
+  // time range and the filter.
+  RemoveAllLastVisitDates(bookmark_model_);
+  ClearDismissedSuggestionsForDebugging(provided_category_);
+  FetchBookmarks();
 }
 
 void BookmarkSuggestionsProvider::ClearCachedSuggestions(Category category) {