Google Chrome on Windows auto update itself on a regular basis. The auto-updating procedure is performed by Google Update. Auto-updated provide fixes to sometimes critical issues.
At times during testing you may not want to update your browser. The test script is written for specific version of browser and may stop working with a new version of browser. During manual testing also, it may not be good idea to switch to new version in between your testing cycle.
Turning off Auto-Update on Windows
To turn off auto-updates of Google Chrome on Windows, you need to instruct Google Update to not update it. To do this,
Set the value of HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Update\AutoUpdateCheckPeriodMinutes to the REG_DWORD value of “0”
If the key is not present, create it.
Turning off Auto-Update on Linux
Google Chrome and Chromium are not auto-updated automatically on Linux; your package manager handles this.
For more information visit The Chromium Projects.