FIX: rollback missing google strategy code

in  this patch
https://github.com/xiaods/nodejs-cantas/commit/b02cce1d0311cc7e693618473504423a6c5da58f

the code Override by another patch. I found it and fix it in
this patch.
Merge pull request #48 from xiaods/issue-804

FIX: rollback missing google strategy code