GitLab

This CL deletes 'signin_icons' and replaces all usage of
'signin:business' with 'cr:domain'.

Change-Id: Ifa234f23af00f0d45e2b528ad4b1d37f3568f2fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490045Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Commit-Queue: Monica Basta <msalama@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819817}