[webkit-qt] Removing support for Qt 4.6 on QtWebKit trunk

[Osztrogonac Csaba]

Andreas Kling írta:
> It's not about using Qt 4.7-only features, it's about keeping trunk 
> clean and free of backwards-compatibility junk.
> 
> We did the same for Qt 4.7 (removing Qt 4.5 support.)

The release date of Qt 4.7 was 2010-09-21 and
the cleanup was on 2010-09-28. (one week later)

I think we should do it similarly _after_ Qt 4.8 release.

br,
Ossy