function deleteRows() {
 var ss = SpreadsheetApp.getActiveSpreadsheet();
 var s = ss.getSheetByName('Copy of TBC Sort');
 var r = s.getRange('C3:C400');
var v = r.getValues();
for(var i=v.length-1;i>=0;i--)
 if(v[0,i]=='Delete Row')
  s.deleteRow(i+1);
 };