Use ICU plural syntax in more place

chrome/browser/ui/toolbar/recent_tabs_sub_menu_model.cc

Index: chrome/browser/ui/toolbar/recent_tabs_sub_menu_model.cc
diff --git a/chrome/browser/ui/toolbar/recent_tabs_sub_menu_model.cc b/chrome/browser/ui/toolbar/recent_tabs_sub_menu_model.cc
index 355b33e32d63d9ddc219cb3537fdbf56063602a8..e53fa02f35d0bc3927116eae65959081e081f398 100644
--- a/chrome/browser/ui/toolbar/recent_tabs_sub_menu_model.cc
+++ b/chrome/browser/ui/toolbar/recent_tabs_sub_menu_model.cc
@@ -534,14 +534,8 @@ void RecentTabsSubMenuModel::BuildLocalWindowItem(
     int curr_model_index) {
   int command_id = WindowVectorIndexToCommandId(local_window_items_.size());
   // See comments in BuildLocalEntries() about usage of InsertItem*At().
-  if (num_tabs == 1) {
-    InsertItemWithStringIdAt(curr_model_index, command_id,
-                             IDS_NEW_TAB_RECENTLY_CLOSED_WINDOW_SINGLE);
-  } else {
-    InsertItemAt(curr_model_index, command_id, l10n_util::GetStringFUTF16(
-        IDS_NEW_TAB_RECENTLY_CLOSED_WINDOW_MULTIPLE,
-        base::IntToString16(num_tabs)));
-  }
+  InsertItemAt(curr_model_index, command_id, l10n_util::GetPluralStringFUTF16(
+      IDS_NEW_TAB_RECENTLY_CLOSED_WINDOW, num_tabs));
   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
   SetIcon(curr_model_index, rb.GetNativeImageNamed(IDR_RECENTLY_CLOSED_WINDOW));
   local_window_items_.push_back(window_id);