Instead, frameNavigated should be issued. Originally frontendReused was introduced to support bookmarklets and instant in chromium. Bookmarklets support does not need it anymore, while instant should be resolved using existing commands.
Closing as invalid, as this bug pertains to the old inspector UI and/or its tests. Please file a new bug (https://www.webkit.org/new-inspector-bug) if the bug/feature/issue is still relevant to WebKit trunk.