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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: Ic6426632f641ac2bfa83616684c7c61d01228e8c
Reviewed-on: https://chromium-review.googlesource.com/961246Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543087}