GN: Re-generate reference.md

Necessary because https://codereview.chromium.org/2773043005/
changed the way GN outputs newlines when generating the reference.

BUG=

Review-Url: https://codereview.chromium.org/2790063007
Cr-Original-Commit-Position: refs/heads/master@{#461839}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: f6b258ce5b3d4224eafd5fb73ed1b38ebf20df3c
1 file changed
tree: c8efae42ae95e9065de30cb9eb24a114e928772d
  1. tools/