PARIS — Chris Froome has a chance to prove over the next three weeks what some suspected in 2012 — that he could have won last year's Tour de France if he hadn't had to give way for his teammate, Bradley Wiggins. Now Wiggins is out injured and that makes the Kenyan-born Briton the favorite to triumph on a particularly mountainous route this year, one that should suit his climbing skills. The 100th edition of the Tour begins Saturday in Corsica — France's "Island of Beauty" in the Mediterranean — the first time cycling's greatest race has set wheel to road in the land of Napoleon's birthplace.