[DevTools] Migrate checkbox label to a proper web component

third_party/WebKit/Source/devtools/front_end/audits/AuditLauncherView.js

Index: third_party/WebKit/Source/devtools/front_end/audits/AuditLauncherView.js
diff --git a/third_party/WebKit/Source/devtools/front_end/audits/AuditLauncherView.js b/third_party/WebKit/Source/devtools/front_end/audits/AuditLauncherView.js
index f573242e2c3469e68b069fda8c160fc4a57cf49e..6f1a58c99724fb1959db45cc0fa24735abd2f416 100644
--- a/third_party/WebKit/Source/devtools/front_end/audits/AuditLauncherView.js
+++ b/third_party/WebKit/Source/devtools/front_end/audits/AuditLauncherView.js
@@ -209,13 +209,12 @@ Audits.AuditLauncherView = class extends UI.VBox {
    * @param {string=} id
    */
   _createCategoryElement(title, id) {
-    var labelElement = UI.createCheckboxLabel(title);
+    var labelElement = UI.CheckboxLabel.create(title);
     if (id) {
       labelElement.id = this._categoryIdPrefix + id;
       labelElement.checkboxElement.addEventListener('click', this._boundCategoryClickListener, false);
     }
-    labelElement.__displayName = title;
-
+    /** @type {!Object} */ (labelElement).__displayName = title;
     return labelElement;
   }