It appears that Google is using the Chrome web browser to install other applications. On OS X El Capitan I've found Google Search is now installed as a seperate application, or at least I now have a random link added in Launchpad.
http://www.cio.com/article/2993065/os-x/os-x-el-capitan-remove-unwanted-google-chrome-apps-from-launchpad.html
Easy enough to remove but still worrying that Google thinks this is okay behaviour.