Not really. All of these are mostly user agent modifications to pretend to be Chrome to make certain sites work, as well as some JavaScript event modification (with a similar purpose).
The only "shady" thing is hiding the Chrome ad on Google's home page, though I guess you can consider that as a convenience once you decide to switch fully to another browser.
I don't know how easy it would be to pull an update for that file however, in which case it could become shady in an instant.
Why would they need to update browser.js to do something shady, they can just drop in a brand new binary that does whatever they want it to do and the vast majority of users would be none the wiser.
The only "shady" thing is hiding the Chrome ad on Google's home page, though I guess you can consider that as a convenience once you decide to switch fully to another browser.
I don't know how easy it would be to pull an update for that file however, in which case it could become shady in an instant.