Bug 914663 - Browser API: mozbrowserwindowresizeto and mozbrowserwindowresizeby events
    add Browser API in keybaord manager and keyboard app, remove hack parts.
Merge pull request #12084 from mpizza/Bug_914663_mozbrowserresize

Bug 891763 - Browser API: mozbrowserwindowresizeto and mozbrowserwindowr... 
r=rudylu