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This CL reverts part of CL/952669 until a better fix is found for showing
the tab switch button (which stopped displaying with CL/952669).

Bug: None
Change-Id: Ia5896087c644f6998350a06d783d7dd58c3f919a
Reviewed-on: https://chromium-review.googlesource.com/961734Reviewed-by: Kevin Bailey <krb@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: Dave Schuyler <dschuyler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543189}