Basically, for example Microsoft is not going to use Flash for their Metro version of their browser in Windows 8. So it seems like only Google has any interest in Flash, out of the Big three of MS, Apple, Google.
Abobe realizes browser flash is dying, and need to put all their developers on Air in a last ditch effort to save some of their development market in this area. So they have slashed Flash development effort.
I think Google now has the only mobile platform that Adobe updated to version 11 with Android. I think Google sees value in being the somewhat exclusive domain of having flash, and Adobe feels they can't support a full development across all platforms, especially when some platforms seem hostile to it's presence, so they are also interested in giving Google as much exclusivity as possible.