Introduce removeElementFromParent helper

src/browser/Dom.ts

@@ -0,0 +1,10 @@
+/**
+ * Copyright (c) 2020 The xterm.js authors. All rights reserved.
+ * @license MIT
+ */
+
+export function removeElementFromParent(...elements: (HTMLElement | undefined)[]): void {
+  for (const e of elements) {
+    e?.parentElement?.removeChild(e);
+  }
+}