There is a difference, and all the html rendering code being written by google is centralization not standardization.

I don't think the linux comparison makes any sense for this situation. Linux has very little to do with the web experience, where the rendering engine is the core of it. Linus's ability to change world wide web standards on a whim is close to non existent. Google is literally replacing the WWW network stack (a good change mind you, but nonetheless demonstrates the level of power)

Linux isn't controlled by an advertising company.

Neither can an open source project be controlled by a single entity

Chromium is.