Issue #3488464: Removed unnecessary ProgressBar~#transitionOut() method.

components/progress-bar/progress-bar.js

@@ -148,7 +148,13 @@
 
       return new Promise(async (resolve, reject) => {
 
-        await this.#transitionOut();
+        this.#setInactive();
+
+        await new Promise((resolve, reject) => {
+
+          window.setTimeout(resolve, this.#transitionDuration * 1.5);
+
+        });
 
         this.uninstall();
         this.#visible = false;
@@ -182,24 +188,6 @@
 
     }
 
-    /**
-     * Transition the progress bar out.
-     *
-     * @return {Promise}
-     *   A Promise that resolves when the transition is considered complete.
-     */
-    #transitionOut() {
-
-      this.#setInactive();
-
-      return new Promise((resolve, reject) => {
-
-        window.setTimeout(resolve, this.#transitionDuration * 1.5);
-
-      });
-
-    }
-
     /**
      * Explicitly set the progress bar to a value.
      *