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The goal is that when we enable kEnableAccessibilityExposeHTMLElement,
relatively few tests will be affected. In this tests, there was
an assumption about nodes being an immediate child of the root element.

Bug: 1063155
Change-Id: I4b6388e5529e1b39cf67881b4830192363106b77
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2206338
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772364}