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It's possible that we may rollback download later feature. We should
not load the download schedule data when the feature is disabled.

Bug: 1114855
Change-Id: Iaca2998a85296f3a16f0b23d14215425356a4895
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2346932Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Hesen Zhang <hesen@chromium.org>
Reviewed-by: Shakti Sahu <shaktisahu@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796912}