R1:6648942bc885

Don't allow "Conpherence" menu items to be added to editable menus if Conpherence is not installed

Summary: Depends on D20336. Ref T13272. Fixes T12745. If you uninstall Conpherence, "Edit Favorites" and other editable menu interfaces still allow you to add "Conpherence" items. Prevent this.

Test Plan:
- Installed Conpherence: Saw option to add a "Conpherence" link when editing favorites menu.
- Uninstalled Conpherence: No more option.

Reviewers: amckinley

Reviewed By: amckinley

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