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This change implements Mac font enumeration browser-side.

The current implementation is located in blink, cached in FontCache.
This browser-side implementation makes the Mac platform in-line with all
the other platform implementations.

A subsequent changelist removes the blink implementation altogether.

Bug: 1043306
Change-Id: Ic6dff854a74d27ad6d3df9d2ef3eb5217e3e55ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2410594
Commit-Queue: Olivier Yiptong <oyiptong@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808024}