refactor(): remove unused dependency from `MdIconService`
refactor(): remove unused dependency from `MdIconService`

Thx @gkalpak

Closes #8456.

HipsterZipster/material,angular/material,DevVersion/material,profoundry-us/material,miguelcobain/material,oostmeijer/material,oostmeijer/material,HipsterZipster/material,graingert/material,j3ski/material,ilovett/material,gkalpak/material,marekmicek/material,crisbeto/material,david-gang/material,daniel-nagy/material,imjoeco/material,vertazzar/material,pwistbac/material,crisbeto/material,programmist/material,DevVersion/material,bluebirdtech/material,graingert/material,Splaktar/material,j3ski/material,gkalpak/material,Frank3K/material,programmist/material,david-gang/material,profoundry-us/material,gkalpak/material,j3ski/material,oostmeijer/material,oostmeijer/material,pwistbac/material,angular/material,clshortfuse/material,pwistbac/material,SamDLT/material,ilovett/material,angular/material,programmist/material,programmist/material,vertazzar/material,marekmicek/material,david-gang/material,vertazzar/material,bluebirdtech/material,welkinhealth/material,epelc/material,ilovett/material,vertazzar/material,HipsterZipster/material,hayloft/material,HarrisCorp/material,imjoeco/material,bluebirdtech/material,HarrisCorp/material,profoundry-us/material,bluebirdtech/material,graingert/material,Frank3K/material,daniel-nagy/material,clshortfuse/material,marekmicek/material,david-gang/material,hayloft/material,crisbeto/material,imjoeco/material,hayloft/material,graingert/material,ilovett/material,Splaktar/material,epelc/material,HarrisCorp/material,miguelcobain/material,imjoeco/material,miguelcobain/material,ServiceManagementGroup/material,DevVersion/material,clshortfuse/material,SamDLT/material,SamDLT/material,Splaktar/material,Splaktar/material,pwistbac/material,welkinhealth/material,miguelcobain/material,j3ski/material,profoundry-us/material,clshortfuse/material,ServiceManagementGroup/material,ServiceManagementGroup/material,daniel-nagy/material,HarrisCorp/material,Frank3K/material,epelc/material,angular/material,ServiceManagementGroup/material,welkinhealth/material,SamDLT/material,gkalpak/material,hayloft/material,HipsterZipster/material,DevVersion/material,marekmicek/material,daniel-nagy/material,epelc/material,crisbeto/material,Frank3K/material,welkinhealth/material