Fix gn bootstrap BUG=833179 R=dpranke Change-Id: Ie9fa320c6d532844f85d34f5d6f8a1195a9eb107 Reviewed-on: https://chromium-review.googlesource.com/1014263 Commit-Queue: Dirk Pranke <dpranke@chromium.org> Reviewed-by: Dirk Pranke <dpranke@chromium.org> Cr-Original-Commit-Position: refs/heads/master@{#551134} Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src Cr-Mirrored-Commit: 8ff145a7c498f584ad875c877fff95e841db9ed1