Switch non-Windows UChar from uint16_t to char16_t.

Bug: 911896
Change-Id: I4482b8fbbfcd8867c25f241707e6ac402a4792ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/deps/icu/+/2653171
Reviewed-by: Frank Tang <ftang@chromium.org>
1 file changed