FilesApp crostini test show downloads when crostini gone

Bug: 845075
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I58042d110a399d6c4d6879132292f9d75a99ad9a
Reviewed-on: https://chromium-review.googlesource.com/1070087Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561025}

ui/file_manager/file_manager/test/crostini.js

@@ -81,6 +81,11 @@ function testCrostiniSuccess(done) {
         return test.waitForElement(
             '#directory-tree .tree-item [root-type-icon="crostini"]');
       })
+      .then(() => {
+        // Downloads folder should be shown when crostini goes away.
+        return test.waitForFiles(
+            test.TestEntryInfo.getExpectedRows(test.BASIC_LOCAL_ENTRY_SET));
+      })
       .then(() => {
         done();
       });