 Complete the following phrase:  Before the Australian Grand Prix of 2008, De la Rosa was elected as the new chairman of the Grand Prix Drivers Association after a uimous vote. De la Rosa was the preferred candidate for GPDA directors Mark Webber and Ferdo Alonso. He replaced the retired Ralf Schumacher in the role. He remained at McLaren in 2009, and as of January 2010 was the fifth most experienced test driver in history, in terms of test days. He stated that he wished to step down from the role of GPDA chairman, following the completion of his deal to drive for Sauber in 2010, and was duly replaced in the role by Nick Heidfeld at the 