R1:7ad3147b3b88

Remove all older-style navs

Summary: Move all navs to use the newer-style, darker, textured look. I'm //pretty// sure this doesn't break anything.

Test Plan: Looked at a bunch of apps.

Reviewers: btrahan, chad

Reviewed By: chad

CC: aran

Differential Revision: https://secure.phabricator.com/D4376