Security and privacy concerns have been raised over a multimillion-dollar proposal by Los Angeles to tap Google’s Internet-based services for government e-mail, police records and other confidential data. At issue is the security of computerized records on everything from police investigations to potholes as the nation’s second-largest city considers dumping its in-house computer network for Google e-mail and office programs that are accessed over the Internet. The president of the LA Police Protective League complained Thursday that the union had scant information on the plan.