WASHINGTON — U.S. Sen. Dianne Feinstein of California, a centrist Democrat and champion of liberal causes who was elected to the Senate in 1992 and broke gender barriers throughout her long career in local and national politics, has died. She was 90.Feinstein died on Thursday night at her home in Washington, D.C., her office said on Friday. Opening the Senate floor, Senate Majority Leader Chuck Schumer announced that “earlier this morning, we lost a giant in the Senate.”“Dianne Feinstein was one of …