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Now that SchedulerSequencedTaskRunner::RunsTasksOnCurrentThread()
returns true iff the current task is part of the
SchedulerSequencedTaskRunner's sequence, the TODO in
SequencedWorkerPool::Inner::IsRunningSequenceOnCurrentThread() does
not apply anymore.

BUG=622400

Review-Url: https://codereview.chromium.org/2343803004
Cr-Commit-Position: refs/heads/master@{#419152}