Clean some harfbuzz-ng sources lists from headers that are gone

Not all sources lists have been kept up to date with code
movement/removal and it seems to make some isolate steps in
cq sad for some CLs (mine).

This is mostly that harfbuzz-ng has stopped using the suffix
"-private" on headers.

Change-Id: I6f3bd45378b011c8ea33fa98053c507fbdc68ed2
Reviewed-on: https://chromium-review.googlesource.com/c/1288791
Reviewed-by: Dominik Röttsches <drott@chromium.org>
Commit-Queue: Dominik Röttsches <drott@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601089}
1 file changed