Before configuring chrome for tor, privoxy, vidalia. Create another link to run chrome always in spy mode to make it more safer. To know how to do this check this tutorial
Now, Open the spy Chrome link or just chrome which you want to set to use proxy and install that extension.
Then go to option of this extension and create a proxy profile and set them like this :
Than go to check.torproject.org. if it shows you page displaying you are using tor than ok. else click on that extension again and recheck. it should make it working for you
Then restart the Chrome.