SAN RAMON, Calif. (AP) — Chevron won’t increase its buyout offer for Anadarko, cutting short a potential bidding war with Occidental Petroleum. Occidental challenged Chevron’s initial bid last month, offering $57 billion in cash and stock, including debt and book value of non-controlling interest. Chevron’s offer was worth about $50 billion by the same metric. Occidental’s bid gained momentum two …