perf(virtual-repeat): fix performance issue in IE
perf(virtual-repeat): fix performance issue in IE

Removes a requestAnimationFrame call, that for some reason, was taking a really long time. It seems counter-intuitive, but it appears to be consistently slower across all browsers.

Fixes #9081.

Closes #9089

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