Fix execute fetch script on Windows.
Fix execute fetch script on Windows.

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