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The callback (init_cb_) is effectively called only once. This is guaranteed by the std::move():
https://cs.chromium.org/chromium/src/media/blink/multibuffer_data_source.cc?rcl=8d2d53d6df3c7347f9d4c32074540b990a8f1736&l=631

This is part of the base::Callback migration.

Context: https://cs.chromium.org/chromium/src/docs/callback.md?rcl=9fcc3764aea8f97e9f6de4a9ee61d554e67edcda&l=40
Change-Id: I1ba81f8b281339cf514baa7f6739425bb9b9988c
Bug: 714018
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2030962
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Auto-Submit: Jose Lopes <jabolopes@google.com>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741166}