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This is a repeating callback because it's called from a call chain that
links to a loop:
* https://cs.chromium.org/chromium/src/media/formats/mp2t/mp2t_stream_parser.cc?rcl=385d1322d09f871a327371f0ded2b2d70714bde2&l=873
* https://cs.chromium.org/chromium/src/media/formats/mp2t/mp2t_stream_parser.cc?rcl=385d1322d09f871a327371f0ded2b2d70714bde2&l=139
* https://cs.chromium.org/chromium/src/media/formats/mp2t/mp2t_stream_parser.cc?rcl=385d1322d09f871a327371f0ded2b2d70714bde2&l=345

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: I51a2e7a5b0fe87b114cbedabe2040961d3bb6215
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2080417
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@{#747205}