Stir in red wine and broth; heat to boiling. Add the browned chicken and bacon, spooning some of the sauce over top of chicken. Reduce heat to medium-low; cover and simmer 20 to 25 minutes, turning chicken once halfway through, until juice of chicken is clear when thickest part is cut to bone (at least 165°F). Stir browned pearl onions and butter into sauce; cook until heated through. Garnish with chopped parsley, and serve.