GitLab

Use transparent smiley for sad-tab favicon

Previous version had white "=(" which wouldn't work well for incognito
after tinting to white (smiley and folder would both be white-ish). With
a transparent smiley the underlying dark-grey tab renders through as
dark eyes for a light-grey folder.

Bug: chromium:834645
Change-Id: I1c4f80004ee7a7227fef231d9b136a4a8c5ee566
Reviewed-on: https://chromium-review.googlesource.com/1022744Reviewed-by: Scott Graham <scottmg@chromium.org>
Reviewed-by: Cait Phillips <caitkp@chromium.org>
Commit-Queue: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552927}