Bug#851479: chrome-gnome-shell: Use python3 instead of python

[Jeremy Bicha]

Patch attached.

And I'm attaching another patch to update some fields now that

Ubuntu never renamed their chromium-browser to chromium so I added an
alternate for that.

Do you think we should mention the extension URLs in the package
description too?

I don't know if anything uses Enhances: now, but Ubuntu's old
software-center used it to show "addons" for a package.

Thanks,
Jeremy Bicha
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