Bug 1505967 [wpt PR 13988] - webkitRelativePath preserves common ancestors, a=testonly

Automatic update from web-platform-testswebkitRelativePath preserves common ancestors (#13988)

Drop requirement that webkitRelativePath only provides the shortest common ancestor, which matches behavior in Edge/Safari/Firefox, and soon Chrome.

Spec change: e6b848f4dc
Tracking issue: WICG/entries-api#18

--

wpt-commits: 378b79a9cd09df75403d88828d1793bb720a9488
wpt-pr: 13988

testing/web-platform/tests/entries-api/file-webkitRelativePath-manual.html

@@ -23,9 +23,10 @@ promise_test(t => filesPromise.then(files => {
     (a, b) => a.name < b.name ? -1 : b.name < a.name ? 1 : 0);
   assert_equals(files[0].name, '1.txt');
   assert_equals(files[1].name, '2.txt');
-  assert_equals(files[0].webkitRelativePath, 'c/d/1.txt');
-  assert_equals(files[1].webkitRelativePath, 'c/d/2.txt');
-  assert_equals(files[2].webkitRelativePath, 'c/3.txt');
+  assert_equals(files[2].name, '3.txt');
+  assert_equals(files[0].webkitRelativePath, 'a/b/c/d/1.txt');
+  assert_equals(files[1].webkitRelativePath, 'a/b/c/d/2.txt');
+  assert_equals(files[2].webkitRelativePath, 'a/b/c/3.txt');
 
 }), 'webkitRelativePath is shortest common ancestor');