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This closure is run as part of a factory method, therefore it can be run
repeatedly:
* https://source.chromium.org/chromium/chromium/src/+/master:media/base/mock_filters.cc;drc=d9b91db0b32bcaed524db17b05f614c7e86326bc;l=232

This is part of the base::Callback migration.

Context: http://doc/1J4N3V5UmzZL9BZGNrn95E4xJu4cz3ynbg21zXR-J_qA#heading=h.uxpxu8vg4k4r

Bug: 1007805
Change-Id: Ied0c7ed6476c29577bf02821a54c71fdf361dd8a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2111096
Commit-Queue: Jose Lopes <jabolopes@google.com>
Auto-Submit: Jose Lopes <jabolopes@google.com>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755890}