Don't reupload bookmarks to Sync every load
Don't reupload bookmarks to Sync every load

Fix #8408

Auditors: @diracdeltas @bbondy

Test Plan:
1. Open Brave and enable Sync.
2. Visit archive.org and bookmark it. Terminal should show that it synced.
3. Close archive.org tab.
4. Restart Brave.
5. Examine terminal. Bookmark shouldn't be re-synced.

luixxiul/browser-laptop,diasdavid/browser-laptop,luixxiul/browser-laptop,luixxiul/browser-laptop,diasdavid/browser-laptop,diasdavid/browser-laptop,diasdavid/browser-laptop,timborden/browser-laptop,timborden/browser-laptop,luixxiul/browser-laptop,timborden/browser-laptop,timborden/browser-laptop