push_notifications: Don't get alert message.
push_notifications: Don't get alert message.

Now we set the alert message in the payload functions for both GCM and APNs so
no need to get it here.

brockwhittaker/zulip,showell/zulip,synicalsyntax/zulip,j831/zulip,christi3k/zulip,shubhamdhama/zulip,zulip/zulip,eeshangarg/zulip,brainwane/zulip,jphilipsen05/zulip,synicalsyntax/zulip,rht/zulip,hackerkid/zulip,eeshangarg/zulip,shubhamdhama/zulip,kou/zulip,punchagan/zulip,amanharitsh123/zulip,vabs22/zulip,ryanbackman/zulip,jackrzhang/zulip,shubhamdhama/zulip,andersk/zulip,mahim97/zulip,brockwhittaker/zulip,eeshangarg/zulip,brainwane/zulip,verma-varsha/zulip,showell/zulip,tommyip/zulip,kou/zulip,zulip/zulip,hackerkid/zulip,mahim97/zulip,vabs22/zulip,Galexrt/zulip,brainwane/zulip,jphilipsen05/zulip,andersk/zulip,eeshangarg/zulip,ryanbackman/zulip,ryanbackman/zulip,hackerkid/zulip,christi3k/zulip,rishig/zulip,punchagan/zulip,mahim97/zulip,rishig/zulip,jphilipsen05/zulip,brainwane/zulip,amanharitsh123/zulip,zulip/zulip,kou/zulip,brockwhittaker/zulip,jphilipsen05/zulip,jrowan/zulip,tommyip/zulip,rht/zulip,synicalsyntax/zulip,Galexrt/zulip,shubhamdhama/zulip,jackrzhang/zulip,mahim97/zulip,Galexrt/zulip,vaidap/zulip,tommyip/zulip,rishig/zulip,tommyip/zulip,j831/zulip,amanharitsh123/zulip,dhcrzf/zulip,vaidap/zulip,jrowan/zulip,christi3k/zulip,timabbott/zulip,Galexrt/zulip,showell/zulip,christi3k/zulip,mahim97/zulip,j831/zulip,verma-varsha/zulip,timabbott/zulip,verma-varsha/zulip,verma-varsha/zulip,synicalsyntax/zulip,andersk/zulip,jackrzhang/zulip,eeshangarg/zulip,jphilipsen05/zulip,showell/zulip,jrowan/zulip,timabbott/zulip,j831/zulip,jrowan/zulip,verma-varsha/zulip,vaidap/zulip,amanharitsh123/zulip,rht/zulip,synicalsyntax/zulip,jackrzhang/zulip,jackrzhang/zulip,Galexrt/zulip,zulip/zulip,hackerkid/zulip,andersk/zulip,timabbott/zulip,jphilipsen05/zulip,verma-varsha/zulip,punchagan/zulip,jrowan/zulip,j831/zulip,vabs22/zulip,rishig/zulip,amanharitsh123/zulip,timabbott/zulip,punchagan/zulip,vabs22/zulip,vabs22/zulip,eeshangarg/zulip,andersk/zulip,kou/zulip,brainwane/zulip,dhcrzf/zulip,vaidap/zulip,dhcrzf/zulip,jackrzhang/zulip,punchagan/zulip,dhcrzf/zulip,vaidap/zulip,rht/zulip,dhcrzf/zulip,j831/zulip,rht/zulip,jackrzhang/zulip,christi3k/zulip,timabbott/zulip,rishig/zulip,showell/zulip,rishig/zulip,tommyip/zulip,synicalsyntax/zulip,punchagan/zulip,eeshangarg/zulip,vabs22/zulip,zulip/zulip,amanharitsh123/zulip,timabbott/zulip,brockwhittaker/zulip,hackerkid/zulip,andersk/zulip,brockwhittaker/zulip,andersk/zulip,kou/zulip,brainwane/zulip,vaidap/zulip,rht/zulip,shubhamdhama/zulip,hackerkid/zulip,ryanbackman/zulip,shubhamdhama/zulip,shubhamdhama/zulip,Galexrt/zulip,ryanbackman/zulip,ryanbackman/zulip,jrowan/zulip,punchagan/zulip,showell/zulip,Galexrt/zulip,hackerkid/zulip,dhcrzf/zulip,mahim97/zulip,tommyip/zulip,dhcrzf/zulip,zulip/zulip,brockwhittaker/zulip,rht/zulip,rishig/zulip,showell/zulip,christi3k/zulip,kou/zulip,brainwane/zulip,kou/zulip,synicalsyntax/zulip,zulip/zulip,tommyip/zulip