Hide the delete menu item from a specific document library

I want to hide the Delete  item menu option for a specific document library.Since it is for a specific library I would not lie to use customcore.js approach.Please sugest some useful javascript for same.

I have already used below javascript in CEWP which I added on the document library page itself(allitems.aspx) but yeild no results:

<script type="text/javascript">
 
var elemTable=document.getElementById('ECBItems');
 
if (elemTable !=null) {
     var elemTBody=elemTable.childNodes[0];

//iterate each table row to find the correct ECB menu item to hide(remove)

   for (var iMenuItem=0; iMenuItem < elemTBody.childNodes.length; iMenuItem++) {
         var elemTR=elemTBody.childNodes[iMenuItem];
         var elemTDTitle=elemTR.childNodes[0];
         var title=GetInnerText(elemTDTitle);
 
 //here we filter on title, but the table contains more information if need be
 
        if(title =='Delete') {
             elemTBody.removeChild(elemTR);
         }
     }
 }
 
</script>

Please suggest which can be kept specific and requires no change in masterpage as same masterpage is used across the site.