California cities can protect workers from being fired immediately when their company changes owners, the state Supreme Court ruled Monday.The 6-1 decision reinstated a Los Angeles ordinance, struck down by lower courts, that required supermarkets to keep their workforce for 90 days after a new owner takes over. Similar laws covering different industries are in effect in other cities - including Oakland, San Jose, Berkeley and Emeryville - and the state also has a law protecting janitors who work for building contractors. "When you're keeping a business open and all you're doing is changing the name