GitLab

Revert of Make chrome/BUILD.gn use symlink.gni rather than symlink.py directly (patchset #1 id:1 of https://codereview.chromium.org/2349603002/ )

Reason for revert:
Breaks BuildPackages due to GN error (https://bugs.chromium.org/p/chromium/issues/detail?id=647706).

BUG=647706

Original issue's description:
> Make chrome/BUILD.gn use symlink.gni rather than symlink.py directly
>
> Committed: https://crrev.com/ca5b9cba81bf335ce205cc06e094587b25c79758
> Cr-Commit-Position: refs/heads/master@{#419168}

TBR=dpranke@chromium.org,agrieve@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2344223002
Cr-Commit-Position: refs/heads/master@{#419190}