Backed out changeset 5562ee8c217a due to in-tree bustage:

checking Python environment is Mozilla virtualenv... /builds/slave/m-in-linux32_g-000000000000000/build/obj-firefox/_virtualenv/bin/python: error while loading shared libraries: libpython2.7.so.1.0: wrong ELF class: ELFCLASS64
Merged default -> production

--HG--
branch : production