The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a4629eb497b5d50a62a6757db82e9996cb69caf7

commit a4629eb497b5d50a62a6757db82e9996cb69caf7
Author: estade <estade@chromium.org>
Date: Mon Oct 10 18:19:25 2016

Fix corners of find bar view by using BubbleBackground instead of a
solid background.

This fixes the appearance in Harmony. It  has little visible effect
pre-Harmony because the roundedness of the border and where
it's drawn relative to the bg mean there's not much overlap
between border and background.

BUG= 653717 

Review-Url: https://codereview.chromium.org/2399033004
Cr-Commit-Position: refs/heads/master@{#424186}

[modify] https://crrev.com/a4629eb497b5d50a62a6757db82e9996cb69caf7/chrome/browser/ui/views/find_bar_view.cc
[modify] https://crrev.com/a4629eb497b5d50a62a6757db82e9996cb69caf7/chrome/browser/ui/views/find_bar_view.h