Add ClearHistory() to ContentSuggestionsService and its providers

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 e76f1647ec98bbb32496155865c48f14214805c8..5283863c2dd5220afa45da359b36b177d7b0ba0f 100644
--- a/components/ntp_snippets/offline_pages/offline_page_suggestions_provider.cc
+++ b/components/ntp_snippets/offline_pages/offline_page_suggestions_provider.cc
@@ -150,6 +150,10 @@ void OfflinePageSuggestionsProvider::FetchSuggestionImage(
       FROM_HERE, base::Bind(callback, suggestion_id, gfx::Image()));
 }
 
+void OfflinePageSuggestionsProvider::ClearHistory() {
+  // Not implemented.

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

^^ :)

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

I cannot understand what you mean.
If adding |^^| after |//|, then it disagrees with "// Ignored" below.

[Marc Treib, 2016/08/29 11:27:35]

Sorry, I meant: Same as the previous comment, i.e. add a TODO

[vitaliii, 2016/08/29 16:46:42]

Done.

+}
+
 void OfflinePageSuggestionsProvider::ClearCachedSuggestions(Category category) {
   // Ignored.
 }