Convert AlertBridge in alert.mojom to new Mojo types

This CL converts AlertBridgeRequest and AlertBridgePtr
to new Mojo types using PendingReceiver, Remote and
Receiver.

Bug: 955171
Change-Id: I24ef7e3f521e7967c75ad7ed8dedb80e3e0e1a2e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1846632
Commit-Queue: Julie Kim <jkim@igalia.com>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704514}
7 files changed