LOS ANGELES — With California gripped by a measles outbreak, Dr. Charles Goodman posted a clear notice in his waiting room and on Facebook: His practice will no longer see children whose parents won’t get them vaccinated. “Parents who choose not to give measles shots, they’re not just putting their kids at risk, but they’re also putting other kids at risk — especially kids in my waiting room,” the Los Angeles pediatrician said. It’s a sentiment echoed by a small number of doctors who in recent years have “fired” patients who continue to believe debunked research linking vaccines to autism.