Revert^2 "Add build rule for jinja lib."

The markupsafe lib wasn't in the master-without-vendor branch due to
there is merge conflict master -> master-without-vendor that has not
been resolved. But markupsafe is merged in master-without-vendor branch
now. ag/12545538. So add the build rule back.

Change-Id: I68808b64c36f7c66081e998d15aaabbad7218ec9
1 file changed