I think mostly the incompatible changes were made in commit
I5a7d73b20617cb3c6d6379084ac4bea23ec3bc74, but I didn't try
to track them down.
Also fix an issue where hrefs in section edit links generated
by this code were wrong.
Bug: T208102
Change-Id: Ibf6564bc0dcb7fcb420739a897b54346a01add02
* Make inserting secondary tab work with Minerva's non-standard structure
of navigation menus
* Distinguish primary and secondary tabs with tiny icons, since Minerva
hides their text
* Hide section edit link dividers (unnecessary when we use icons)
Bug: T208102
Change-Id: Ieaec60165617e3b423ec58857d6f0a0406e22b1d