Disclaimer: Make sure you have a decent backup as I'm pointing you in the direction of hidden system folders here.... any and all of the below is strictly at your own risk....
My suggestion would be to delete Google Chrome and all its little hidden files too, i.e. something along the following lines....
1. Go to Applications and delete Google Chrome
2. Whilst in the finder, choose Go -> Go To Folder and enter "~/Library" and....
Open the "Application Support" folder and trash anything that mentions Google
Go back and open the "Preferences" folder and trash anything that mentions Google (typically for stuff in here you are looking for items named in a convention com.google or com.google.somethingelse)
Go back and open open the "Caches" folder and trash anything that mentions google (you'll probably find the naming convention is similar to Preferences)
Go back and open the "Saved Application State" and ....
Go back and trash the "Google" folder at the main level
Go back and drill down to "Speech/Speakable Items/Application Speakable Items" and trash the Google Chrome folder.
3. Download the latest chrome