[tools] IC-explorer drilldown consecutive file upload bug fix

Change-Id: I02baea85ff93683848f2f5a4571a0d94d3821f0c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2249673
Commit-Queue: Sathya Gunasekaran  <gsathya@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68412}

tools/ic-explorer.html

@@ -337,15 +337,9 @@ code is governed by a BSD-style license that can be found in the LICENSE file.
       details.style.display = display;
     }
 
-    function removeOptions(selectElement) {
-      while(selectElement.options.length > 0) {
-          selectElement.remove(0);
-      }
-    }
-
     function initGroupKeySelect() {
       let select = document.getElementById("group-key");
-      removeOptions(select);
+      select.options.length = 0;
       for (let i in properties) {
         let option = document.createElement("option");
         option.text = properties[i];