If the extension was installed via Group Policy and you have administrator access, you can manually remove the "force-install" instruction from the Windows Registry. [DISCUSSION] Symantec Endpoint Protection | Page 64
If you are an IT administrator, or you have local admin rights on your company laptop, you can permanently disable the SEP Chrome extension across the entire machine. disable symantec endpoint protection chrome extension
To re-enable:
If the extension is stuck and the "Remove" button in Chrome is greyed out, it's likely being forced via the Windows Registry. Use this method only if you are comfortable editing registry keys. If the extension was installed via Group Policy
Find the Symantec extension and to gray (Off). disable symantec endpoint protection chrome extension