Remove PhabricatorProfileHeaderView in favor of PhabricatorHeaderView

Summary:
We have this old view which is only used in two places and looks the same but has totally different markup. Get rid of it.

@chad, I'm generally going to move the user/project profiles a step toward looking like other object detail view with the custom field stuff. Not sure if you have any grand vision here; we can easily do something else later since this is like 80% "delete weird epriestley one-offs that don't look quite right in favor of standard elements".

Test Plan: {F49324} {F49325} {F49326}

Reviewers: chad, btrahan

Reviewed By: chad

CC: aran

Differential Revision: https://secure.phabricator.com/D6394