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This CL converts base::Bind and base::Callback in //media/muxers/ to
Once or Repeating

Bug: 1007809
Change-Id: I9d412676b0c9386de89d400e2126af2e20745821
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2065333Reviewed-by: Miguel Casas <mcasas@chromium.org>
Commit-Queue: Jun Cai <juncai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743152}