It sounds like you allowed Google.com to track your location at some point. This is a permission in the browser. If you'd like to disable location services in Google Chrome, you can follow these steps:
- Use the menu button in the upper right of the browser and go to "Settings", then use the "Show Advanced Settings" link at the bottom of the page
- Under "Privacy", you will click Content button
- About halfway through the resulting dialog, you'll find the "Location" section
- Select a permission level that fits your preference
From your question, it sounds like you don't object to other sites tracking your location, just the specific one. In this case you may want to use the default "Ask when a site tries to track your physical location" image, and use an exception to deny that to the specific site. You could also use the other two options to achieve the same thing. Here's another article on this.