Roll icu for TZ2019b

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}

DEPS

@@ -1014,7 +1014,7 @@ deps = {
     Var('chromium_git') + '/chromium/deps/hunspell_dictionaries.git' + '@' + 'ecb3c4f4ce2c13278699489bd6356a31e1ee4d11',
 
   'src/third_party/icu':
-    Var('chromium_git') + '/chromium/deps/icu.git' + '@' + '682a230923933a7157a41b88c7804b6b7d2abdfa',
+    Var('chromium_git') + '/chromium/deps/icu.git' + '@' + '9a5af81f58a2bc2ea7a887505e38b50021496194',
 
   'src/third_party/icu4j': {
       'packages': [