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Roll HarfBuzz to 1.7.3 to incorporate hb_set changes which improve
dealing with fonts containing incorrectly sorted range information, such
as the Chandas Devanagari font part of the ttf-devanagari-fonts package,
as identified in
https://bugs.chromium.org/p/chromium/issues/detail?id=794896

Cherry-pick 2fe5f885..a9432bde on top of 1.7.3 to incorporate hb_set
regression fixes.

Bug: 794896, 796124
Change-Id: I9256018b6ec6c7e84f9261c97758b2bee2d410a2
Tbr: kojii, eae, behdad
Reviewed-on: https://chromium-review.googlesource.com/831946
Commit-Queue: Dominik Röttsches <drott@chromium.org>
Reviewed-by: Dominik Röttsches <drott@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Cr-Commit-Position: refs/heads/master@{#525317}