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Per discussion at TPAC, this value that was previously only a parameter
on IDBDatabase.transaction is now visible on the IDBTransaction itself.

This experimental option is behind the
RuntimeEnabledFeatures::IDBRelaxedDurabilityEnabled flag.

Bug: 965883
Change-Id: Iace6607b0b28702de3e9bd397f9942e9457f1cad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1818462Reviewed-by: Joshua Bell <jsbell@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Commit-Queue: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699862}