Unfortunately, the Content Blocker API only works with Safari itself, not other browsers that use the Safari engine (alternative engines are not allowed on iOS).
If you want content-blocking in an alternative browser, it would need to be built in (as in the Adblock Browser, another ABP product), and there's not much you can do for the WebViews you see in many non-browser apps.
The most you
can do about ads in most apps is use a PAC file, like Weblock allows you to configure (or use
http://www.speedmeup.net/ for a pre-setup one, although that one
does break some sites, like KrebsOnSecurity), and set up a fake VPN profile, as an app called Adblock (orange-and-black icon, from DeepMind, the makers of Weblock) does.
I've also read about
an alternative DNS service for blocking ads, which might pick up where BA.net and FoolDNS let us down.