[MD History] Small accessibility fixes.

chrome/browser/ui/webui/md_history_ui.cc

Index: chrome/browser/ui/webui/md_history_ui.cc
diff --git a/chrome/browser/ui/webui/md_history_ui.cc b/chrome/browser/ui/webui/md_history_ui.cc
index 31c5ceceaf249d4f8c7a9b74212498118c076fd9..060910c06e61328d6c124a87489c010130462b18 100644
--- a/chrome/browser/ui/webui/md_history_ui.cc
+++ b/chrome/browser/ui/webui/md_history_ui.cc
@@ -39,6 +39,7 @@ content::WebUIDataSource* CreateMdHistoryUIHTMLSource(Profile* profile) {
       content::WebUIDataSource::Create(chrome::kChromeUIHistoryHost);
 
   // Localized strings (alphabetical order).
+  source->AddLocalizedString("bookmarked", IDS_HISTORY_ENTRY_BOOKMARKED);
   source->AddLocalizedString("cancel", IDS_CANCEL);
   source->AddLocalizedString("clearBrowsingData",
                              IDS_CLEAR_BROWSING_DATA_TITLE);
@@ -52,6 +53,7 @@ content::WebUIDataSource* CreateMdHistoryUIHTMLSource(Profile* profile) {
                              IDS_HISTORY_OTHER_SESSIONS_HIDE_FOR_NOW);
   source->AddLocalizedString(
       "deleteWarning", IDS_HISTORY_DELETE_PRIOR_VISITS_WARNING_NO_INCOGNITO);
+  source->AddLocalizedString("entrySummary", IDS_HISTORY_ENTRY_SUMMARY);
   source->AddLocalizedString("expandSessionButton",
                              IDS_HISTORY_OTHER_SESSIONS_EXPAND_SESSION);
   source->AddLocalizedString("foundSearchResults",