Fix gn bootstrap BUG=827899 R=dpranke Change-Id: Idb5832232d46ffda9df2d540523031a9edfdad44 Reviewed-on: https://chromium-review.googlesource.com/990959 Reviewed-by: Dirk Pranke <dpranke@chromium.org> Commit-Queue: Thomas Anderson <thomasanderson@chromium.org> Cr-Original-Commit-Position: refs/heads/master@{#547559} Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src Cr-Mirrored-Commit: e65dd61a5fea51751b5be4cdeede0aedc0eb34d6