GitLab

Sets the unfocused omnibox background to the same color as the results
popup, which is conventionally white.

Also enables the location bar border stroke in this mode, which already
exists for high contrast mode.

Bug: 931836
Change-Id: I97e0a5c768c739f4f037d9e3abdb99115b14999d
Reviewed-on: https://chromium-review.googlesource.com/c/1474281Reviewed-by: Kevin Bailey <krb@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: Tommy Li <tommycli@chromium.org>
Auto-Submit: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#632737}