As a Target "beauty concierge," young Chelsea Mathison prowls the cosmetic aisles at the retailer's Nicollet Mall store, sweetly asking shoppers if they need beauty tips and recommendations. The pixieish clerk seems an unlikely front-line warrior in the Minneapolis-based retailer's effort to embrace showrooming -- where consumers fiddle with products in stores, only to surf their smartphones to see if they can buy the items cheaper somewhere else.