[MemoryCache] Apply suffixes to Blink.MemoryCache.RevalidationPolicy.Preload
[MemoryCache] Apply suffixes to Blink.MemoryCache.RevalidationPolicy.Preload

Follow-up fix of https://codereview.chromium.org/1642523002/.

BUG=579496

Review URL: https://codereview.chromium.org/1651033002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#372708}

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