https://github.com/pagespeed/ngx_pagespeed/pull/1329
With 247a821 submitted we no longer need to keep separate master and
trunk-trackingbranches. After this change is in people can build
ngx_pagespeed from master with:
cd ngx_pagespeed/
scripts/build_ngx_pagespeed.sh --psol-from-source
But: this pull request is a placeholder. What I actually intend to do
is delete master and force-push trunk-tracking over it.
Jeff