Fix flaky FileSystemApiOpenMultipleWritableExistingFilesTest test

Ensure entry names are in sort order before checking the entry values.
Bot logs say (issue 1103147 #c13) test cannot assume sort order.

Bug: 1103147
Change-Id: I0dff82fe9e3b51d84a768ffb6e4e3a205c59b5a5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2359662Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799027}

chrome/test/data/extensions/api_test/file_system/open_multiple_writable_existing_with_write/test.js

@@ -8,6 +8,10 @@ chrome.test.runTests([
         {acceptsMultiple: true, type: 'openWritableFile'},
         chrome.test.callbackPass(function(entries) {
           chrome.test.assertEq(2, entries.length);
+          // Ensure entry names are in sort order: crbug.com/1103147
+          if (entries[0].name === 'open_existing2.txt') {
+            entries = [entries[1], entries[0]];
+          }
           checkEntry(entries[0], 'open_existing1.txt', false, true);
           checkEntry(entries[1], 'open_existing2.txt', false, true);
         })