Revert this one for now, it causes bug 290936.

I was wrong: we need to only call KRun for HTML files. Otherwise, when clicking
on a directory, kfmclient calls KRun which starts kfmclient which calls KRun...

It sounds like the only proper fix for this would be to have a KRun-derived
class in kfmclient, which gets notified of the found mimetype and can then
decide what to do. On the other hand we could also just associate the browser
app with text/html in the KCM, and use existing mechanisms instead of piling
more logic into kfmclient.

CCBUG: 182591
BUG: 290936
FIXED-IN: 4.8.0
(cherry picked from commit d882d2a5)