[Development] fixing name of QNetworkAccessManager::createRequest

[Robin Burchell]

2012/1/13 Thiago Macieira <thiago.macieira at intel.com>:
> So, changing the name of this function is:
>
>  - of little practical benefit
>  - not 100% automatable without a code scanner
>  - dangerous, as it creates silent bugs

what about the slightly more garden-variety approach of deprecating
the old one and introducing a new method?