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This is split out from the CL to test all widgets and views for nameless
focusable objects. See crrev.com/c/951933.

Bug: 819350
Change-Id: Iecef5783a292363f8f994cdce5f5f24f92d48025
Reviewed-on: https://chromium-review.googlesource.com/961281Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542905}