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This is a repeating callback because it's called from a while loop:
  * https://cs.chromium.org/chromium/src/media/formats/mp2t/es_adapter_video.cc?rcl=2d18a6603bb1f5bbe784dad83e7cad005808686a&l=166

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: I3b7dfb4b58ec6918ebc4dc504b839bddd115c64a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2080261
Commit-Queue: Jose Lopes <jabolopes@google.com>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746706}