A well-known California surfer — who once survived a shark attack — was found dead in Mexico, according to local reports.Adam Francis D’Esposito — known as Biff — went down to Baja, an area in Tijuana popular with surfers, on Sept. 5 in his father’s 2001 silver Volvo, saying he would be back the next day, according to his family.The 39-year-old was last seen on Sept. 8 by the owner of a surf shop, who described him as “in a bad state” and “scared,&rdquo . . .