GitLab

This CL moves SigninUtils to signin.ui target.

Bug: 1163470
Change-Id: I24da246f47205e60cdbb2be66bb4527eb7c26ace
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2640397Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Alice Wang <aliceywang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845558}