Well it appears to be none. This awesome site will show you the hit location of a pitcher in a different park. Translating Bailey's stats from Oakland to Fenway, you can see that none of his balls in play would turn into HRs.
He only gave up 3HRs last year on the road too.
Hopefully Adrian will return to 2010, as this has him with 29 home runs at Fenway. THat's more than all last season. If we use his 2010 road total, that's 46 homers, if we use his 2010 road total, that's 49.
Bailey link is messed up, just put in the options though.