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This callback is repeating because it is used as part of a handler for an event,
which can fire repeatedly:
* https://cs.chromium.org/chromium/src/chrome/renderer/media/cast_transport_ipc.cc?sq=package:chromium&dr&g=0&l=135

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: Ic2ef406352713bf023bfa476688c9c7a89e5a2df
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2071894
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Auto-Submit: Jose Lopes <jabolopes@google.com>
Cr-Commit-Position: refs/heads/master@{#745083}