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This is a repeated callback because it's called from a while loop:
* https://cs.chromium.org/chromium/src/media/formats/mp2t/es_parser_adts.cc?rcl=db95e8ed4d10f4770b37e265ca78c906e344c6ef&l=212
* https://cs.chromium.org/chromium/src/media/formats/mp2t/es_parser_h264.cc?rcl=db95e8ed4d10f4770b37e265ca78c906e344c6ef&l=361

This is part of the base::Callback migration.

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

TBR=danakj@chromium.org

Bug: 714018
Change-Id: Ifb0f1119c2ed834bdfa4328afce0931c7776a626
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2080354
Commit-Queue: Jose Lopes <jabolopes@google.com>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746714}