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Database data loss is a non-standard extension to IDBVersionChangeEvent
(https://www.w3.org/Bugs/Public/show_bug.cgi?id=22370). This state only
needs to be persisted as part of the database open. So moving this value
from IndexedDBCallbacks (used for any IDB call) to
IndexedDBPendingConnection (only used during database open).

BUG=627484

Review-Url: https://codereview.chromium.org/2140193002
Cr-Commit-Position: refs/heads/master@{#407208}