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This is a repeating callback because it is run by an event handler:
* https://cs.chromium.org/chromium/src/components/mirroring/service/udp_socket_client.cc?rcl=9de1b156267c48a11dcd12948c1ab7bfe81fd008&l=164

and it is also called repeatedly from a while loop:
* https://cs.chromium.org/chromium/src/media/cast/net/udp_transport_impl.cc?rcl=9de1b156267c48a11dcd12948c1ab7bfe81fd008&l=208
* https://cs.chromium.org/chromium/src/media/cast/net/udp_transport_impl.cc?rcl=9de1b156267c48a11dcd12948c1ab7bfe81fd008&l=217

This is part of the base::Callback migration.

Context: https://cs.chromium.org/chromium/src/docs/callback.md?rcl=9fcc3764aea8f97e9f6de4a9ee61d554e67edcda&l=40

Bug: 714018
Change-Id: I265bfe00a5063e85a3461533019bfbc4f598f609
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2073763
Commit-Queue: Jose Lopes <jabolopes@google.com>
Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745421}