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Looking at the UMA value of DirectWrite.Fonts.Loaded, 1000->1750 will
take us from ~96% to >99% of users having all their fonts loaded.

Hopefully this will alleviate most annoyance until the proxy code is
ready.

R=shrikant@chromium.org
BUG=413059

Review URL: https://codereview.chromium.org/557633003

Cr-Commit-Position: refs/heads/master@{#294522}