Bug 1034570 - Notify the user if initial registration fails r=arthurcc

Notification API has nothing to do with this. It will use the file you give it. I don't know the current behavior but HIDPI stuff is handled at build system level ; the way it works has changed recently, so I can't tell exactly.

But for instance: $ find . | grep captivePortal
./build_stage/system/style/icons/captivePortal.png
./apps/system/style/icons/captivePortal@2x.png
./apps/system/style/icons/captivePortal@1.5x.png
./apps/system/style/icons/captivePortal@2.25x.png
./apps/system/style/icons/captivePortal.png