Google just made it easier to grab high-quality still images from videos — and it works in a bunch of browsers. In a post on Google’s Keyword blog aimed at students, the company announced a new feature built into Chrome that lets you capture a high-quality, non-overlayed frame from the source video. Just right-click on the video when paused and select “Copy Video Frame.” It might not work on all videos — actually, as far as I can tell, it mostly just works on YouTube — but it…