The Hearst Corp. said Tuesday that unless the San Francisco Chronicle can undertake "critical" cost cutting measures including job cuts within weeks, the company will be forced to sell or close the newspaper. Hearst said the Chronicle lost more than $50 million last year and added that, "this year's losses to date are worse." The Chronicle has had major losses each year since 2001, Hearst said. The closely-held media company said cost reductions including an unspecified reduction in union and non-union employees are needed to restore the Chronicle to health.