FCBarca
Mes que un Rag
Fabregas did. Although De Gea would most likely want to join Barca if they were interested I don't think he'd start wearing Barca shirts and acting like Fabregas did to force the move. He'd just do the 'Barca is a dream but I'm happy in Manchester' speech.
Don't confuse players or backgrounds. Cesc was a Catalan cantera player, he was always coming back - Gooners should get over it already. Most Barcelona fans think he could've done more to push for the move or bring the price down with a transfer request but Fabregas did nothing apart from privately letting Wenger know it was time. De Gea wouldn't have the shirt prank played on him and I doubt very much he'd ever say it was his dream to play for Barcelona. Players who come through the youth ranks of Atletico don't aspire to play for RM but they respect Barcelona more. So if David was indeed homesick, there's no question that dream would then be to play for Barcelona.
If Barcelona decided he was their #1 and made it clear to him or his advisors that they wanted him, I'm pretty certain he would be push for it. Still, I doubt very much he'd publicly push for it or that he's their #1 target. But as jojo pointed out, Barcelona doesn't pay big money for keepers. I do think Courtois intrigues them and that they think they can bring the price down but probably not enough for them to be happy paying it. Even money, I think they'd opt for Courtois but I personally prefer Ter Stegen.