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This CL removes the non-forced dice migration.
There code to perform the forced migration is not removed.

Bug: 777774
Change-Id: Icdcb6cbaa1eeaa2ff174bc4c73d3a93e919665ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1917177
Commit-Queue: David Roger <droger@chromium.org>
Reviewed-by: Alex Ilin <alexilin@chromium.org>
Reviewed-by: Monica Basta <msalama@chromium.org>
Cr-Commit-Position: refs/heads/master@{#717666}