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after a refactoring at http://crrev.com/ad6d8a9bbf9bd5e2.
As a follow-up of the refactoring, this CL inlines the alias to its users
in //media

base: :StaticAtomicSequenceNumber is an alias of base::AtomicSequenceNumber
Change-Id: Ifed4e77d7b0af0ee1ed084b9aed72be4503694c3
Reviewed-on: https://chromium-review.googlesource.com/568198
Commit-Queue: Taiju Tsuiki <tzik@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486285}