Remove link_languages. It was only ever supported by the SCons generator, which is long gone.
Remove link_languages. It was only ever supported by the SCons generator,
which is long gone.

R=thakis@chromium.org

Review URL: https://codereview.chromium.org/23477054
old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google