Apple's approach in Safari is to only show the hostname in the address bar, unless the address bar has focus. This works pretty well in general (for non-power-users). Unfortunately, for a data URL, it just shows as much of the URL as fits. This may well include the phony “https://account.google.com” part of the URL and thus still mislead naive users.

At the very least it'll still look different, which might hopefully make the user take a closer look. For example, for normal URLs, you never seen the https:// part (unless the address bar has focus). Even if you enable the advanced preference to show the full website address again, it still hides the https:// part.