(Bloomberg) -- Toshiba Corp. shareholders voted to oust Chairman of the Board Osamu Nagayama in a rare triumph for activist investors seeking fundamental reform after years of scandal and allegations of mismanagement.The surprise decision on Nagayama, the 74-year-old outside director some investors opposed publicly, came after a contentious meeting with shareholders that extended for nearly three hours. His departure marks a high point in the months-long campaign by largest shareholder Effissimo