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account. Weighting by size means that large entries will get thrown out
of the cache sooner and the end result is that the cache will have more,
but smaller entries.

Design doc: https://docs.google.com/document/d/1N07uwDiOipRcMG3SanxR8X8flvxrh9Axi1SLpfRNKCY/edit

BUG=700102, 736437

Review-Url: https://codereview.chromium.org/2918893002
Cr-Commit-Position: refs/heads/master@{#488058}