The revelation that Liberty Mutual paid chairman Edmund F. “Ted’’ Kelly roughly $200 million over the past four years has angered some customers and watchdog groups. Nancy Geiser of Natick has been a Liberty Mutual customer for 27 years, but said she decided to start shopping for a new insurance company after the Globe reported that the Boston insurance giant paid its top executive about $50 million a year, making him one of the highest paid CEOs in the country.