As I can see current geolocation mechanism uses google api with default GOOGLE_API_KEY. It's also affects #8754
MacOS has location api https://developer.apple.com/reference/corelocation and there are a lot of different ways to implement it in general.
Same for Windows. It has Sensor API https://msdn.microsoft.com/en-us/library/windows/desktop/dd318953 and looks like it works for Windows 7 also.
What do you think about it? When it can be implemented?

Added: However looks like location sensor should be installed and enabled http://www.techsupportalert.com/content/how-enable-or-disable-location-sensing-windows-7-and-8.htm