I'm not sure how you somehow drew the conclusion that Windows' warning is better than Chrome's.
Windows says "Now I know I say this for literally every program you download, but I'll say it again. It might be harmful because all programs can do anything at all. Good luck!".
Chrome says: "This might be harmful and it can do these things: X, Y, Z."
Apart from the stupid scrollbar issue that's clearly better.
The only problem is they have done the permission model that we've known for like a decade is broken: ask for permissions up front, you can grant all or deny all.
Could they not have spoken to the Android team who spent like a decade fixing that mistake and moving to fine grained on demand permission prompts?