MD Bookmarks: Add full support for cut/copy/paste keyboard shortcuts

chrome/browser/ui/webui/md_bookmarks/md_bookmarks_ui.cc

Index: chrome/browser/ui/webui/md_bookmarks/md_bookmarks_ui.cc
diff --git a/chrome/browser/ui/webui/md_bookmarks/md_bookmarks_ui.cc b/chrome/browser/ui/webui/md_bookmarks/md_bookmarks_ui.cc
index d16575a36c2d20b49ba9f4114adf0378a86f75ed..546981b90428c717e3739e29479e2e8d39d21c5b 100644
--- a/chrome/browser/ui/webui/md_bookmarks/md_bookmarks_ui.cc
+++ b/chrome/browser/ui/webui/md_bookmarks/md_bookmarks_ui.cc
@@ -187,6 +187,8 @@ MdBookmarksUI::MdBookmarksUI(content::WebUI* web_ui) : WebUIController(web_ui) {
   auto plural_string_handler = base::MakeUnique<PluralStringHandler>();
   plural_string_handler->AddLocalizedString(
       "toastItemsDeleted", IDS_MD_BOOKMARK_MANAGER_TOAST_ITEMS_DELETED);
+  plural_string_handler->AddLocalizedString(
+      "toastItemsCopied", IDS_MD_BOOKMARK_MANAGER_TOAST_ITEMS_COPIED);
   web_ui->AddMessageHandler(std::move(plural_string_handler));
 
   web_ui->AddMessageHandler(base::MakeUnique<BookmarksMessageHandler>());