What strikes me first is how much code there is…
There are tons of code, some things copied multiple times, because Chrome nowadays does a lot of things; basically it’s an entire operating system, which accesses USB, runs assembly code, runs WebGL, basically all.
And it’s all in C++, and very verbose Google C++.
But in the end I always found what I was looking for there. And I can’t say how good or bad the C++ is, as I’m not C++ dev. Just there is a LOT of it.