Best method to short an ic chip on board
That's normally done with a removable jumper included in the design of the board. After the fact, not so easy, though it can be done with a fixture that forces a couple of sprung pins onto pads on the board. 

After-market, soldering on a rework wire is best, either at the pins themselves or, for a fine-pitched part, at the closest, or most suitable, point they are connected to.