indexeddb: add comment about corruption blob dir handling
This was confusing about why the leveldb database was deleted in one place but the blob directory was deleted in another. New databases will always need to clean up their blob directory, so it always must be done there. Additionally, the blob directory (although we could guess it) is a property of an open database, and so is hard to plumb through to this point to delete as well. Change-Id: I33de3a30910b931c2edf7765cf797e02ed8f46eb Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2518198 Commit-Queue: enne <enne@chromium.org> Commit-Queue: Victor Costan <pwnall@chromium.org> Auto-Submit: enne <enne@chromium.org> Reviewed-by:Victor Costan <pwnall@chromium.org> Cr-Commit-Position: refs/heads/master@{#823753}
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