Simplifying Firefox download script, fixing bugs, disabling on win/mac.

It's unlikely I'll implement the FF test on win or mac anytime soon, so
I may as well clean up that code. Also the script has broken on Win
because of a Firefox-side change: disabling the script on win/mac for
now.

TBR=kjellander@chromium.org

Review URL: https://codereview.chromium.org/942783002

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/webrtc/webrtc.DEPS@294138 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
1 file changed