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This CL converts remained old Mojo types of DnsConfigChangeManager
interface to new Mojo types. Major changes are as below,

  - Convert mojom::DnsConfigChangeManagerPtr to
    mojo::PendingRemote|Remote<mojom::DnsConfigChangeManager>
  - Convert mojo::DnsConfigChangeManagerRequest to
    mojo::PendingReceiver<mojom::DnsConfigChangeManager>
  - Convert mojo::Binding to mojo::Receiver

Bug: 955171
Change-Id: Iea32edc6bc502514792114d2adf71cdffb5f8c6a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1896490
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712888}