Remove newFromMenu() from SideNav
Summary: Ref T10054. Just simplifying this a bit before I start laying in the new profile menus.
Test Plan:
- Viewed Diviner on desktop and checked the mobile menu.
- Viewed Files on desktop and checked the mobile menu.
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T10054
Differential Revision: https://secure.phabricator.com/D15015