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It's just a guess but I'd say it's because it's using the most battery... If you click on the Chrome entry in that table it'll give you the details about its usage. I don't use Chrome so I've no idea about its usage. It might be running in the background and if you leave it pointed at a site that updates, say, adverts that would explain it. The stock browser certainly used to do this and as a consequence I always make sure I kill all the tabs I'm finished with.
Probably have open tabs that have something working. Close them.
Probably have open tabs that have something working. Close them.