Google’s hurricane force of disruption to traditional mobile businesses seems to be slowing to a strong gale, as the company pulls in its horns in some areas – adjusting its investment priorities in a world of changing competitive forces and rising challenges. Or perhaps the wild child of Silicon Valley is just growing up. Last week, the company was reported to be halving the workforce at its Fiber unit, and now it seems to have halted Project Ara, the modular smartphone initiative which was supposed to transform the economics of mobile devices for vendors and consumers and apply an open source model to hardware. Instead, the company is apparently taking a conventional route, planning a new handset brand, Pixel and…