First you have to install the apps Shared Contacts Manager on the Chrome Web Store. Details of the installation are in this video on youtube.
For deleting a shared contact :
1 - Search the contact by entering his email and click on "Get Information"
2 - Once contact his find
3 - Click on "Delete Shared Contact" to delete the entry
4- Deletion will be confirmed on the screen
Delete a shared contact is really simple with Shared Contact Manager even if you don't know the ID of the Shared Contact !!!
How to ? >