Backed out 2 changesets (bug 1470510) for causing bustages in widget/cocoa/nsChildView.mm CLOSED TREE

Backed out changeset a343f30c34a3 (bug 1470510)
Backed out changeset 4da64790094d (bug 1470510)

--HG--
rename : xpfe/appshell/nsIAppWindow.idl => xpfe/appshell/nsIXULWindow.idl
rename : xpfe/appshell/AppWindow.cpp => xpfe/appshell/nsXULWindow.cpp
rename : xpfe/appshell/AppWindow.h => xpfe/appshell/nsXULWindow.h