Mark the area to cut out with the lasso, then use the clone stamp tool to get the white shades to replace it. If you don't get it to match, I would airbrush careful (low fill&opacity) in high zoom, just freehand work..
Since you ask this i assume you are not familiar with clone stamp. First left-click w alt-key to get the strt-point to where from you want to clone. then the first after that click just begins to fill ever after from that startpoint. try it and you'll see how it works
/D