LOS ANGELES/NEW YORK (Reuters) – Chase Carey, Twenty-First Century Fox’s president and chief operating officer, may be feeling pressure to stay in his job for several more years both from his boss, Rupert Murdoch, and from the company Murdoch is trying to buy, Time Warner Inc. As Murdoch mulls his next step following Time Warner’s rejection of his $80 billion offer, some Time Warner investors say they are concerned about who might succeed the 83-year-old chairman and chief executive.