Allows specifying target_arch in download script
Allows specifying target_arch in download script

deepak1556/libchromiumcontent,electron/libchromiumcontent,jlord/libchromiumcontent,atom/libchromiumcontent,jlord/libchromiumcontent,electron/libchromiumcontent,hokein/libchromiumcontent,bbondy/libchromiumcontent,synaptek/libchromiumcontent,eric-seekas/libchromiumcontent,adamjgray/libchromiumcontent,paulcbetts/libchromiumcontent,deepak1556/libchromiumcontent,zhanggyb/libchromiumcontent,adamjgray/libchromiumcontent,hokein/libchromiumcontent,zhanggyb/libchromiumcontent,brave/libchromiumcontent,synaptek/libchromiumcontent,brave/libchromiumcontent,atom/libchromiumcontent,eric-seekas/libchromiumcontent,paulcbetts/libchromiumcontent,bbondy/libchromiumcontent