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When the number of font files exceeds 1750, we fallback to this list.
Include Verdana, Georgia, and Trebuchet MS in this list until font
loading is properly fixed.

R=shrikant@chromium.org,ananta@chromium.org
BUG=421305

Review URL: https://codereview.chromium.org/668743002

Cr-Commit-Position: refs/heads/master@{#300323}