Fix gn bootstrap TBR=dpranke Change-Id: I72e33bdcd009b62853434507f3096199e921c28d Reviewed-on: https://chromium-review.googlesource.com/1005446 Reviewed-by: Thomas Anderson <thomasanderson@chromium.org> Commit-Queue: Thomas Anderson <thomasanderson@chromium.org> Cr-Original-Commit-Position: refs/heads/master@{#549588} Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src Cr-Mirrored-Commit: e20ec0676c3adbdb4fb37acc17e692cb397f8ed0