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This callback is run as part of an event handler:
* https://cs.chromium.org/chromium/src/chrome/renderer/media/cast_transport_ipc.cc?rcl=9de1b156267c48a11dcd12948c1ab7bfe81fd008&l=174

which in turn is called by an IPC handler:
* https://cs.chromium.org/chromium/src/chrome/renderer/media/cast_ipc_dispatcher.cc?rcl=9de1b156267c48a11dcd12948c1ab7bfe81fd008&l=139

registered in:
* https://cs.chromium.org/chromium/src/chrome/renderer/media/cast_ipc_dispatcher.cc?rcl=9de1b156267c48a11dcd12948c1ab7bfe81fd008&l=57

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: I3ae9158ba5186a5cf686d877845fb3d23090488c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2073722
Commit-Queue: Jose Lopes <jabolopes@google.com>
Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745409}