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When indexeddb moves to the storage service, this static getter will use
the file system proxy for the storage service instead of an unrestricted
one.

See: https://chromium-review.googlesource.com/c/chromium/src/+/2079642

Bug: 1052045
Change-Id: I8e02c888ea548d4fd60bda4c221f785a442a3aab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2333057
Auto-Submit: enne <enne@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Commit-Queue: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794671}