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This CL applies pending_remote to RequestNotifications in
NetworkChagneManager interface.

  - Convert FooPtr to mojo::PendingRemote or mojo::Remote.
  - Convert mojo::Binding to mojo::Receiver

Bug: 955171
Change-Id: I3b730b082bdb64b8b49c7df181bb2fb3bd0e7eb4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1883951
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Sam McNally <sammc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710184}