FS: Recursive RemoveEntry for non-existent handle throws NotFoundError.

This change ensures that FileSystemDirectoryHandle.removeEntry throws a
'NotFoundError' DOMException when attempting to remove a non-existent
entry with recursive set to true. Previously, it returned undefined
instead of throwing the expected DOMException.

Bug: 362301049
Change-Id: I17873135fade0f25068fcbca53ed9faf0a363ee3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5990675
Reviewed-by: François Degros <[email protected]>
Reviewed-by: Marijn Kruisselbrink <[email protected]>
Commit-Queue: Xiaohan Zhao <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1407002}

Author: XiaohanZ777

fs/script-tests/FileSystemDirectoryHandle-removeEntry.js

@@ -128,3 +128,13 @@ directory_test(async (t, root) => {
 
   assert_array_equals(await getSortedDirectoryEntries(root), []);
 }, 'createWritable after removeEntry succeeds but doesnt recreate the file');
+
+directory_test(async (t, root) => {
+  // root
+  // ├──file-to-keep
+  // ├──dir-to-keep
+  await createFileWithContents('file-to-keep', 'abc', root);
+  const dir_to_keep = await root.getDirectoryHandle('dir-to-keep', {create: true});
+  await promise_rejects_dom(
+      t, 'NotFoundError', root.removeEntry('dir-to-remove', {recursive: true}));
+}, 'removeEntry() on a non-existent directory recursively should throw NotFoundError');