Add ClearHistory() to ContentSuggestionsService and its 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 8919f16619aa1c61d297cb9eefb087c4b045122b..9f8f3290d3fff2a9c793292cdb2c943d5c3af7d4 100644
--- a/components/ntp_snippets/bookmarks/bookmark_suggestions_provider.cc
+++ b/components/ntp_snippets/bookmarks/bookmark_suggestions_provider.cc
@@ -184,6 +184,10 @@ void BookmarkSuggestionsProvider::FetchSuggestionImage(
       FROM_HERE, base::Bind(callback, suggestion_id, gfx::Image()));
 }
 
+void BookmarkSuggestionsProvider::ClearHistory() {
+  // Not implemented.

[Marc Treib, 2016/08/29 09:43:11]

Add a TODO and reference the bug?

[vitaliii, 2016/08/29 10:37:25]

Done.

+}
+
 void BookmarkSuggestionsProvider::ClearCachedSuggestions(Category category) {
   DCHECK_EQ(category, provided_category_);
   // Ignored.