@GossiTheDog @aral looks like a misleading article. While the messages appear, you don't need to interact with any of them to download Chrome.
One: It's the link immediately under the banner.
Two: Ignore
Three: Ignore, the download is already complete and you were probably going to close edge anyway.
Four: See three
Edit: I just checked, nothing is "Injected" into the google pages either, they appear to run in independent viewports that aren't part of the main browser viewport.