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This is a repeating callback because it's called from a for loop:
* https://cs.chromium.org/chromium/src/media/formats/mp2t/ts_section_pat.cc?rcl=12cb56005b4e382d8ba25cec382deb04bc024369&l=105

This is part of the base::Callback migration.

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

Bug: 1007806
Change-Id: I3fd346d4f02ea0281a9eb716090ff76cdf6d5a73
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2080359
Commit-Queue: Jose Lopes <jabolopes@google.com>
Reviewed-by: Albert J. Wong <ajwong@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747167}