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Store the creation and modification dates as base::Time fields in
DocumentMetadata.

Bug: 93619
Change-Id: I34eedf5cf88dd102e492ed0451d3e4a4a7988cc6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2610626
Commit-Queue: Daniel Hosseinian <dhoss@chromium.org>
Reviewed-by: K. Moon <kmoon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843376}