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The callback is called once to indicate the initialization is complete:
* https://cs.chromium.org/chromium/src/media/base/decryptor.h?rcl=bf6cbdd206196a39ecce5575a8a828eaa844dcb5&l=92

The initialization operations are defined in:
* https://cs.chromium.org/chromium/src/media/base/decryptor.h?rcl=bf6cbdd206196a39ecce5575a8a828eaa844dcb5&l=98

This is part of the base::Callback migration.

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

Bug: 714018
Change-Id: I7a2f3245f6d03eeed83c79a6155f1678aae136d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2050588
Commit-Queue: Jose Lopes <jabolopes@google.com>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743894}