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I recently updated Google Chrome and
also encountered this problem.
After doing a reboot I noticed that Google Chrome now appears twice searching for it in slingshot
Attaching a screenshot
The way I remove unwanted icons is use the program menulibre.
sudo apt-get install menulibre
That will give you a menu editor.
Open the Menu Editor and search for Chrome. Hide the icon and save your settings. Close and reopen the Application Bar and see if your duplicate is gone.
Required, but never shown