Patch for /google/gmail/gmail.go for go1.03

```
Update for modern golang version
```

Original issue reported on code.google.com by `ruslan.khusnullin@gmail.com` on 11 Dec 2012 at 7:00

Attachments:
- [gmail.go.patch](https://storage.googleapis.com/google-code-attachments/rsc/issue-2/comment-0/gmail.go.patch)
