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This CL converts MdnsListenClientPtr and Binding<MdnsListenClient>
in chrome and services to the new Mojo type, and
uses pending_remote<T> in host_resolver.mojom.

Bug: 955171
Change-Id: Ie1821bd2d5edbbbcfc14ce8380053ce9cfaa2be5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1860535
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#706412}