Most certainly not the only reason why and possibly not even the most important, but the EU has started to load up on the anti monopoly against Google recently, with talks about breaking it up in Europe (similar to the Microsoft case in the US some years ago, although it didn't go through and in this case it would only split in EU).
http://www.theguardian.com/technology/2014/nov/27/european-p...
> The European parliament has approved a motion calling for tougher regulation of internet search, including suggesting breaking up Google as a solution to its dominance in Europe.
That certainly wasn't a done deal nor even agreed that's what the commission would really aim for, but the heat was mounting and Google's move cut them short just in case.