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This reverts commit ce5f0c23.

Reason for revert: presumably caused crashes on internal tests
(see https://crbug.com/860250 and https://crbug.com/860268 for
builder links).

Original change's description:
> Roll HarfBuzz to 1.8.2 plus build fix
> 
> https://chromium.googlesource.com/external/github.com/harfbuzz/harfbuzz/+log/957e7756634..2cb075fe26
> 
> Contains a fix for Khmer shaping.
> 
> Bug: 847034
> Change-Id: I0ac1fdf4df69e5c5dd3cc8a877809db99ce40fda
> Reviewed-on: https://chromium-review.googlesource.com/1123826
> Reviewed-by: Ben Wagner <bungeman@chromium.org>
> Commit-Queue: Dominik Röttsches <drott@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#572188}

TBR=bungeman@chromium.org,kojii@chromium.org,drott@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 847034, 860250, 860268
Change-Id: Icd36bffb962ca04e99eda0c56779ce1a21b4ce26
Reviewed-on: https://chromium-review.googlesource.com/1126339Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Commit-Queue: Boris Sazonov <bsazonov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572603}