Bug 938304 - navigator.mozPay(): callbacks do not pass through result (desktop fix). r=ferjm

--HG--
rename : webapprt/test/chrome/mozpay-success.html => webapprt/test/chrome/mozpay-failure.html
Bug 962857 - Fix for debugger mistakenly detecting .jsm files are minified. r=fitzgen
Bug 977188 - Report security errors separately in the Developer HUD. r=21