K7 extension gets installed through Enterprise policy, so that user cannot remove it.
In order to remove the extension, follow the below steps.
1) Open Run-> Regedit
2) Navigate to Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome\ExtensionInstallForcelist
3) Remove the entries of K7 extensions at Right side (dlpfamleaodfgmfnggonbfljhjggbdbe)
4) Close Chrome browser and reopen, K7 extension would be removed.