This was written in 2011 so a few important things have happened since then. That being said, I regularly work within the Chromium code base and I find most of this information to still be fairly accurate.
What has changed?
I know very little about front-end development and have been looking to learn it. Assume that I know nothing and will take whatever is said in the article (minus what you tell me is out-of-date) to be true.