Clear browsing data from ContentSuggestionService only if exists.

chrome/browser/browsing_data/browsing_data_remover.cc

Index: chrome/browser/browsing_data/browsing_data_remover.cc
diff --git a/chrome/browser/browsing_data/browsing_data_remover.cc b/chrome/browser/browsing_data/browsing_data_remover.cc
index aaf1e6074e4a670877882e04657f7ae74a704959..1077cf1270616820b20c6dfbebb3d1f981c19f92 100644
--- a/chrome/browser/browsing_data/browsing_data_remover.cc
+++ b/chrome/browser/browsing_data/browsing_data_remover.cc
@@ -522,7 +522,7 @@ void BrowsingDataRemover::RemoveImpl(
     }
 
     ntp_snippets::ContentSuggestionsService* content_suggestions_service =
-        ContentSuggestionsServiceFactory::GetForProfile(profile_);

[Marc Treib, 2016/09/15 12:45:09]

GetForProfile is called in one more place in this file, you should update that
too.

[jkrcal, 2016/09/15 12:53:17]

Oh, thanks for spotting that!

[Bernhard Bauer, 2016/09/15 13:44:46]

Should we add a DCHECK that the feature is enabled when constructing the service
so that we catch any regressions here?

+        ContentSuggestionsServiceFactory::GetForProfileIfExists(profile_);
     if (content_suggestions_service) {
       content_suggestions_service->ClearHistory(delete_begin_, delete_end_,
                                                 filter);