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This CL converts DnsConfigChangeManagerClient{Ptr, Request} in
chrome and services to the new Mojo type, and uses
pending_remote<DnsConfigChangeManagerClient> in host_resolver.mojom.

Bug: 955171
Change-Id: If8038bf601d99eb11c6f62f250872919fa6338f8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1859655
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705871}