[fix bug 764183] Remove bulk delete from User in Admin Panel.
[fix bug 764183] Remove bulk delete from User in Admin Panel.

brian-yang/mozillians,akarki15/mozillians,johngian/mozillians,hoosteeno/mozillians,ChristineLaMuse/mozillians,akarki15/mozillians,safwanrahman/mozillians,glogiotatidis/mozillians-new,ChristineLaMuse/mozillians,fxa90id/mozillians,hoosteeno/mozillians,chirilo/mozillians,johngian/mozillians,glogiotatidis/mozillians-new,akatsoulas/mozillians,mozilla/mozillians,justinpotts/mozillians,brian-yang/mozillians,akatsoulas/mozillians,satdav/mozillians,johngian/mozillians,mozilla/mozillians,chirilo/mozillians,satdav/mozillians,glogiotatidis/mozillians-new,akatsoulas/mozillians,safwanrahman/mozillians,chirilo/mozillians,safwanrahman/mozillians,ChristineLaMuse/mozillians,mozilla/mozillians,hoosteeno/mozillians,safwanrahman/mozillians,justinpotts/mozillians,fxa90id/mozillians,akarki15/mozillians,fxa90id/mozillians,anistark/mozillians,glogiotatidis/mozillians-new,anistark/mozillians,brian-yang/mozillians,brian-yang/mozillians,anistark/mozillians,chirilo/mozillians,justinpotts/mozillians,fxa90id/mozillians,hoosteeno/mozillians,satdav/mozillians,akarki15/mozillians,anistark/mozillians,justinpotts/mozillians,akatsoulas/mozillians,satdav/mozillians,johngian/mozillians,mozilla/mozillians