Possibly related, possible dupe of  bug 791757 

Is this the same as 791757?

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/3700a46c532af05ed573ee417e2437c398352fcb

commit 3700a46c532af05ed573ee417e2437c398352fcb
Author: Aaron Leventhal <aleventhal@chromium.org>
Date: Mon Jan 22 16:30:58 2018

Remove spurious focus event in UI during tab switching

Do not advance focus to the IconLabelBubbleView when switching tabs as
this causes screen readers to read the contents of that view, and in the
case of JAWS, causes it to also not read the new focus within the tab.

The spurious focus event was caused by the following line:
SetFocusBehavior(FocusBehavior::NEVER);
This resulted in a call to View::AdvanceFocusIfNecessary().

This CL cleans up the code path that occurs when we are emptying the
content area prior to attaching new content, including only the
necessary lines of code that would have run, need to run and
are not harmful to accessibility.

Bug:  791757 , 777051 
Change-Id: I81cfd39710e0bb0beaeb8a571ce3b899e9b71d7e
Reviewed-on: https://chromium-review.googlesource.com/868475
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#530878}
[modify] https://crrev.com/3700a46c532af05ed573ee417e2437c398352fcb/chrome/browser/ui/views/frame/browser_view.cc
[modify] https://crrev.com/3700a46c532af05ed573ee417e2437c398352fcb/chrome/browser/ui/views/frame/browser_view_focus_uitest.cc