How to remove content from Google?

If you have access to the site, then use this tool
http://services.google.com/urlconsole/controller

But this tool will not actually delete the URL from the index - it will separate from the results for 180 days. After that point, the URL may return to the index if it is still found and will be continuously crawled during this time. You will need to create a new account to use this tool. In order to remove the page or pages, you have to either make sure that the page returns code 404 or adjust the robots.txt file, the robots meta-tag of the page.