Update safety number change warning dialog

ts/util/index.ts

@@ -6,6 +6,10 @@ import { createBatcher } from './batcher';
 import { createWaitBatcher } from './waitBatcher';
 import { deleteForEveryone } from './deleteForEveryone';
 import { downloadAttachment } from './downloadAttachment';
+import {
+  generateSecurityNumber,
+  getPlaceholder as getSafetyNumberPlaceholder,
+} from './safetyNumber';
 import { hasExpired } from './hasExpired';
 import { isFileDangerous } from './isFileDangerous';
 import { makeLookup } from './makeLookup';
@@ -20,6 +24,8 @@ export {
   createWaitBatcher,
   deleteForEveryone,
   downloadAttachment,
+  generateSecurityNumber,
+  getSafetyNumberPlaceholder,
   GoogleChrome,
   hasExpired,
   isFileDangerous,