ui: Cleanup class/struct forward declarations

chrome/browser/ntp_snippets/download_suggestions_provider.cc

Index: chrome/browser/ntp_snippets/download_suggestions_provider.cc
diff --git a/chrome/browser/ntp_snippets/download_suggestions_provider.cc b/chrome/browser/ntp_snippets/download_suggestions_provider.cc
index 2cdcce67fdb378cbf79a7d469020bc1dc1981c18..767ad8e9d3dde4776da694ad0a7e1219b28adfa3 100644
--- a/chrome/browser/ntp_snippets/download_suggestions_provider.cc
+++ b/chrome/browser/ntp_snippets/download_suggestions_provider.cc
@@ -398,8 +398,6 @@ void DownloadSuggestionsProvider::SubmitContentSuggestions() {
 
 ContentSuggestion DownloadSuggestionsProvider::ConvertOfflinePage(
     const OfflinePageItem& offline_page) const {
-  // TODO(vitaliii): Make sure the URL is actually opened as an offline URL even
-  // when the user is online. See crbug.com/641568.
   ContentSuggestion suggestion(
       ContentSuggestion::ID(provided_category_, GetOfflinePagePerCategoryID(
                                                     offline_page.offline_id)),