Roll HarfBuzz to fix Tamil MN and Khmer issues

https://chromium.googlesource.com/external/github.com/harfbuzz/harfbuzz/+log/992b7128656e72..574d888c8a

Compare https://github.com/harfbuzz/harfbuzz/issues/1410

Bug: 894354
Change-Id: Ibfaa54ed22e72ed36731f2ca22037d5deb15f81b
Tbr: eae, behdad
Reviewed-on: https://chromium-review.googlesource.com/c/1349978
Reviewed-by: Dominik Röttsches <drott@chromium.org>
Commit-Queue: Dominik Röttsches <drott@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610818}
27 files changed