Hello Emacs devs,
I was using JavaScript mode a while ago and noticed that the 
string “test” appeared in the echo area after performing certain 
commands.  I found that a debugging message had been left in js.el 
for quite a while.  This patch removes it.

Also, I would like to make it known that I have completed the FSF 
copyright assignment paperwork.  It shouldn’t be necessary for 
this trivial patch, but I plan on submitting more patches in 
future.

Thanks for your time,
Matt