Remove obsolete public buildspec conversion module.

This was only used in backfill_git_tags.py, which was removed in
https://chromereviews.googleplex.com/212817013.

BUG=455404
R=agable@chromium.org, laforge@chromium.org

Review URL: https://codereview.chromium.org/1185003002.

git-svn-id: http://src.chromium.org/svn/trunk/tools/deps2git@295695 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
1 file changed