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$ TEMPDIR=$(mktemp -d)
$ dpkg -X ./google-chrome-stable_current_amd64.deb $TEMPDIR

If you look in the extracted files, it includes:


$ ls -al etc/cron.daily/google-chrome 
lrwxrwxrwx 1 browser browser 37 Apr 21 10:50 etc/cron.daily/google-chrome -> /opt/google/chrome/cron/google-chrome
$ file opt/google/chrome/cron/google-chrome 
opt/google/chrome/cron/google-chrome: POSIX shell script, ASCII text executable

Looking in that script, it adds a keyring in /usr/share/keyrings:


GPG_FILE="/usr/share/keyrings/google-chrome.gpg"

install_key() {
  #... 
  # Use a temporary file to ensure atomic updates
  echo "$PGP_KEY_DATA" | base64 -d >"$GPG_FILE.$$.tmp"
  chmod 644 "$GPG_FILE.$$.tmp"
  mv "$GPG_FILE.$$.tmp" "$GPG_FILE"
}

And adds an apt source signed by that key:


gen_sources_content() {
  cat <<EOF
### THIS FILE IS AUTOMATICALLY CONFIGURED ###
# Changes to this file will not be preserved.
# This file will not be recreated if removed.
X-Repolib-Name: Google Chrome
Types: deb
URIs: https://dl.google.com/linux/chrome-stable/deb/
Suites: stable
Components: main
Signed-By: $GPG_FILE
EOF
}

No, I will not add your apt repo.