Move vertical orientation character function to using ICU

Since ICU 63 the library provides a function for returning Unicode TR#50
vertical orientation information. Instead of maintaining our own
codepoint set definition, move this to using the ICU function.

Thanks for Frank Tang (ftang@) for adding these parts of ICU to our ICU
build.

Bug: 882279
Change-Id: I462d45e23ed822ebebefe5a4071d1df5b4db2e09
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1602495
Commit-Queue: Koji Ishii <kojii@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Auto-Submit: Dominik Röttsches <drott@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663475}
4 files changed