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Update 1: Google is more or less ready with the initial prototype of Chromium on Mac OS X you can create windows and tabs just like the Windows version of Chrome but the mac version uses a Cocoa UI layer on top. Will updates this page when the official mac release of Google Chrome is out.
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I did some searching, and what I found seemed very similar -- that there is a large amount of the Mac codebase that's in C++ and Carbon, and the UI segment is written in Cocoa. So it's not a pure Cocoa app. I didn't find any detailed technical analyses of the Mac version. You probably would have heard about it if there was a subsequent re-write of the C++ segment to make all of Chrome:Mac Cocoa.
...Google Chrome already came out with the the stable official mac release like 4 days ago...your article is nearly 2 years ago.
Thanks, that an assumption or a fact?