A common solution for developers using Linux distributions were
/usr/bin/python is linked to /usr/bin/python3 is to put a python ->
python2 symlink earlier in the PATH when working with python2-only
projects. This doesn't work when shebangs bypasses any environment
configuration.

The change was generated by executing:
  sed -i 's|#!/usr/bin/python|#!/usr/bin/env python|' \
    $(grep -rl '#!/usr/bin/python' build)

Change-Id: I2de77532fd31a0348ec58f4d9af4b7172dc1b9ed
Reviewed-on: https://chromium-review.googlesource.com/559347


Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Ingemar Ådahl <ingemara@opera.com>
Cr-Commit-Position: refs/heads/master@{#484266}