There is no about:config in Chrome/Chromium, but is there an extension that opens up more ways to configure the browser?
Searching for configuration, preferences, etc, in the extension page gives too many hits to go through manually.
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There isn't. Chromium extensions have so little capability (basically iFrames and UserJS and that's it) that even if someone wanted to, they really couldn't make one.
But all is not lost. Most of Google Chrome's advanced config stuff is done in commandline switches. Here's a pretty comprehensive list.