GitLab

DialogPlate will now notify a pool of observers as opposed to a single
delegate.

Bug: b:80542452
Change-Id: I776ad59eac9c684ae8719eb1a43dc017064b4473
Reviewed-on: https://chromium-review.googlesource.com/1112061
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570240}