“Dark Knight” soared into the record books, “High School Musical” danced its way onto the big screen and a tiny Chihuahua proved it could beat the box office big boys.Hollywood loves breaking box-office records, yet studio executives aren’t griping that their 2008 lineup will fall a bit shy of the all-time high set a year earlier. Movie moguls are just glad to have weathered the year with faithful audiences that continued to crowd into theaters.