Fix one pixel black line in Picture-in-Picture window

Bug: 935881
Change-Id: I26f88e8d1b692b2391ad943e6264794c902638bc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1499542
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Auto-Submit: François Beaufort <beaufort.francois@gmail.com>
Cr-Commit-Position: refs/heads/master@{#639098}
1 file changed