The Chromebook world has really amounted to a two-horse town: you’ve had to like either Acer’s designs or Samsung’s if you’ve wanted Chrome OS on the move. Lenovo is at last pushing out the borders, however slightly, with the ThinkPad X131e Chromebook. As suggested by the name, it’s a subtle adaptation of the existing X131e (pictured above) to Google’s platform, where the only real hardware difference is AMD’s removal from the options list. The s…