[Smart Lock] Fix a failing DCHECK

The setup notification title does not have a placeholder string, so don't try to
substitute one.

BUG=453147
TEST=none
R=tengs@chromium.org

Review URL: https://codereview.chromium.org/884783004

Cr-Commit-Position: refs/heads/master@{#314046}

chrome/browser/extensions/api/easy_unlock_private/easy_unlock_private_api.cc

@@ -134,8 +134,7 @@ bool EasyUnlockPrivateGetStringsFunction::RunSync() {
   // Setup notification strings.
   strings->SetString(
       "setupNotificationTitle",
-      l10n_util::GetStringFUTF16(IDS_EASY_UNLOCK_SETUP_NOTIFICATION_TITLE,
-                                 device_type));
+      l10n_util::GetStringUTF16(IDS_EASY_UNLOCK_SETUP_NOTIFICATION_TITLE));
   strings->SetString(
       "setupNotificationMessage",
       l10n_util::GetStringFUTF16(IDS_EASY_UNLOCK_SETUP_NOTIFICATION_MESSAGE,