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In this patch, the class does nothing interesting,
but would have a dynamic instance management in
following changes.

Migration would happen per platform behind a
field study.

See crbug.com/672793 for rough design and plan.

BUG=672793

Review-Url: https://codereview.chromium.org/2566673002
Cr-Commit-Position: refs/heads/master@{#438765}