I am implementing google maps on my website and I just started noticing this line appearing. It only happens in Chrome (Windows) and no matter how far I step back in my code
I am also seeing this problem. It seems to appear whenever a vertical scrollbar is displayed. Tom's above answer removes the scrollbar, but that might not be a viable solution for most people. This is most likely a Chrome bug. They've made a lot of changes to the scrollbars over the past months, so this isn't surprising.