Remove DOM prototype patching of createTextChild(ren)

Bug: chromium:1011811
Change-Id: I44a66c10efd317dcb7d5a4f58ab4be0fded4b215
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2466182
Reviewed-by: Alex Rudenko <[email protected]>
Reviewed-by: Tim van der Lippe <[email protected]>
Commit-Queue: Sigurd Schneider <[email protected]>
diff --git a/front_end/elements/MetricsSidebarPane.js b/front_end/elements/MetricsSidebarPane.js
index beeed47..900d1ac 100644
--- a/front_end/elements/MetricsSidebarPane.js
+++ b/front_end/elements/MetricsSidebarPane.js
@@ -312,7 +312,7 @@
             'dblclick', this.startEditing.bind(this, heightElement, 'height', 'height', style), false);
 
         boxElement.appendChild(widthElement);
-        boxElement.createTextChild(' × ');
+        UI.UIUtils.createTextChild(boxElement, ' × ');
         boxElement.appendChild(heightElement);
       } else {
         const suffix = (name === 'border' ? '-width' : '');