Fix gn bootstrap.

BUG=None
TEST=./tools/gn/bootstrap/bootstrap.py
R=brettw@chromium.org

Review URL: https://codereview.chromium.org/1280113002

Cr-Original-Commit-Position: refs/heads/master@{#342532}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: c9b8dabce977ae9eacc19653b2a149ce2d181ce3
1 file changed
tree: 997c1d4098012c6969d76c1e4d7b1d1881417e91
  1. tools/