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I ran into this, and it annoyed me enough to figure out how to stop the Chrome auto-updates.



This is a little convoluted and requires admin rights on the target machine, but as far as I can tell, it is working.  Instructions summarized from here and based upon my Windows 7 system:

https://support.google.com/installer/answer/146164#Obtaining_the_Administrative_Tem

1. 
   Download template from Google:
   
   http://dl.google.com/update2/enterprise/GoogleUpdate.adm


2. 
   Open the group policy editor on your target computer.  I did this in Windows 7 by searching for "group policy" in the Control Panel.  This opened the Local Group Policy Editor.


3. 
   Highlight Computer Configuration > Administrative Templates.


4. 
   Action menu > Add/Remove Templates...


5. 
   Add... and load up the GoogleUpdate template you downloaded.


6. 
   Close the Add/Remove Templates window.


7. 
   Go to Computer Configuration > Administrative Templates [ > Classic Administrative Templates (ADM)] > Google > Google Update > Applications


8. 
   If you want a shortcut, you can disable all application updates by changing the "Update policy override default" setting in Applications.  Otherwise, you can set the policy for an individual application by going a level down in the specific application folder.  On mine, I set the "Update policy override default" setting for only the four applications beginning with "Google Chrome".
   
   
   
   Edit the "Update policy override default" setting wherever you prefer by double or right clicking it.
   
   - Change it to "Enabled"
   
   - Under "Options:", change "Policy" to "Updates disabled".
   
   - Click "OK" to save.


9. 
   When you're done disabling updates for whatever applications you prefer, do "File > Exit".

Now you've disabled the application settings.  Uninstall Chrome.  Download Chrome 31 from FileHippo, and reinstall Chrome 31.

http://www.filehippo.com/download_google_chrome/54482/