1. They would not.
2. Chelsea is not a top tier team.
and before you ask : Barca, Bayern, Real, Dortmund, United, (Juventus) in that order.
Maybe you could make a case that Giroud/Mertesacker could theoretically be rotation players for Juventus.
They would not even be bench players for Barca, Bayern or Real though. Maybe Mertesacker could be a 4th stringer and take van Buyten's place for Bayern but Giroud would be a 4th stringer for 1 striker spot.
Arsenal simply lacks matured talent to compete with the big teams, I don't see it on their team. Wilshere is probably the only one that would be seriously coveted by top teams.