All Chancellor Worf did was name his succssor and immediatly passed over the office to him. Must be one of the Shortest reigns as Chancellor in Klingon History. The situtation with Gowron wasn't the same as when K'mpec was murdered. If Duras had straight up defeated K'mpec in a fight he would have succeded K'mpec but he didn't. But perhaps whilst Duras was alive as inferred in "Sins of the Father" the KE was a lot less politically stable.
Though one wonders how Klingon history will record the fact that Worf was responsible for Gowron coming to power by killing Duras, and for removing Gowron from power.