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This fixes a bug on Windows in which switching to a new tab via a
keyboard shortcut did not focus the tab. Instead, the CaptionBubble was
focused by the FocusManager. This caused keyboard shortcuts, such as
Ctrl+W, to not work. This occurred even if the CaptionBubble was not
not visible.

Bug: 1055150, 1123635
Change-Id: I614715f75f1ff36fb336ae13ca3a53178413ca8d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2482005
Commit-Queue: Abigail Klein <abigailbklein@google.com>
Reviewed-by: Peter Boström <pbos@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823622}