GN: Fix bootstrap.py on mac

R=brettw@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1895413005

Cr-Original-Commit-Position: refs/heads/master@{#388548}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: edafde65ae1b3e753dfabdaaffddafacd6e44805
1 file changed
tree: 882943193aae230500f2089712a9007f9e6f3b46
  1. tools/