GitLab

This CL converts ColorPanel and ColorPanelHost to
new Mojo types using PendingReceiver, Receiver,
PendingRemote, Remote and SelfOwnedReceiver.

Bug: 955171
Change-Id: Ie147c1bde436e427ca086a21a5ba7dd16e33b26a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1847491Reviewed-by: ccameron <ccameron@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Commit-Queue: Julie Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#704438}