With something of a surprise announcement, Google has unveiled the Google TV Streamer and killed off the Chromecast line. While it looks like a decent set-top box streamer with plenty of good features, I think Google has missed a trick here. Unlike its predecessors under the Chromecast branding, the Google TV Streamer is designed to be on show. It’s not an HDMI dongle that’s hidden behind your TV. Google describes the device as having “beautiful design that blends with any decor”, which is a similar line to those used to promote previous smart home products, including Nest devices. I’m incline…