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The font fallback is returning a specific typeface. The
specific typeface should be used when available to avoid
a font family match (which may leads to a different font
being used).

As an example, on Fuchsia the script Bengali is using the
'Mukti Narrow' which is not getting match correctly. That
makes the script being broken. We are not seeing a
regression since the expensive fallbacks algorithm is
catching the broken cases.

see:
  https://chromium-review.googlesource.com/c/chromium/src/+/1824104
  http://crbug.com/1003829

Bug: 1008407, 1018321
Change-Id: I668382707e24ecc267a82531ad2a77c23283b2b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1884657Reviewed-by: Robert Liao <robliao@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710065}