Fix gn bootstrap BUG=805488 R=dpranke Change-Id: I8a6daa7bbce3fec4eabdeae9b2e7adf7f732813b Reviewed-on: https://chromium-review.googlesource.com/885006 Reviewed-by: Dirk Pranke <dpranke@chromium.org> Commit-Queue: Thomas Anderson <thomasanderson@chromium.org> Cr-Original-Commit-Position: refs/heads/master@{#531798} Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src Cr-Mirrored-Commit: 0b186aa6f4104fe333e4d73b88e06e33abf536bb