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The RestoreData class is the full restore data in memory to be written
to the FullRestoreData file.

There will be some separate CLs to convert RestoreData to JSON format,
and write the full restore data to a file.

BUG=1146900

Change-Id: I7b51b0ba6e1cbe4f7a4b763a52e81f273a74c8d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2581702Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836523}