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This CL fixes a missing close() call in VariationsSeedLoader by using
ScopedFD instead of a raw int when opening the seed file.

Bug: 1138713
Change-Id: I547769c6385507cbe8fc876eb233dd0eacdb2d6a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2519741Reviewed-by: Changwan Ryu <changwan@chromium.org>
Commit-Queue: Robbie McElrath <rmcelrath@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826530}