An interesting catch by Volker Weber (he's quoting from the related Google page)
Your copy of Google Chrome includes one or more unique application numbers. These numbers and information about your installation of the browser (e.g., version number, language) will be sent to Google when you first install and use it and when Google Chrome automatically checks for updates. If you choose to send usage statistics and crash reports to Google, the browser will send us this information along with a unique application number as well. Crash reports can contain information from files, applications and services that were running at the time of a malfunction.