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https://chromium.googlesource.com/chromium/deps/icu.git/+log/682a230..9a5af81f5
9a5af81 Update IANA timezone db to 2019b

Bug: chromium:991739
Change-Id: I9b4fbc96932a2ce7fc15528ae107e757905dee30
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1747366Reviewed-by: Jungshik Shin <jshin@chromium.org>
Commit-Queue: Jungshik Shin <jshin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686259}