Roll ICU to d888fd2

$ git log c8ca296..d888fd2 --date=short --no-merges --format='%ad %ae
%s'
2018-02-05 jshin@chromium.org Update IANA tzdata to 2018c
2018-01-23 digit@google.com SmallIntFormatter: simplify implementation.

In JS console:
> new Date(Date.UTC(2018, 9,31, 5)).toLocaleString("en", {timeZone: 'America/Sao_Paulo'})
"10/31/2018, 2:00:00 AM"
> new Date(Date.UTC(2017, 9,31, 5)).toLocaleString("en", {timeZone: 'America/Sao_Paulo'})
"10/31/2017, 3:00:00 AM"

TBR=mark@chromium.org

Bug: 473288,802890
Test: See the above
Change-Id: I341d11a5b62bd7fa2d5473575591f50060c04870
Reviewed-on: https://chromium-review.googlesource.com/902806
Commit-Queue: Jungshik Shin <jshin@chromium.org>
Reviewed-by: Jungshik Shin <jshin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534533}

DEPS

@@ -414,7 +414,7 @@ deps = {
     Var('chromium_git') + '/chromium/deps/hunspell_dictionaries.git' + '@' + 'a9bac57ce6c9d390a52ebaad3259f5fdb871210e',
 
   'src/third_party/icu':
-    Var('chromium_git') + '/chromium/deps/icu.git' + '@' + 'c8ca2962b46670ec89071ffd1291688983cd319c',
+    Var('chromium_git') + '/chromium/deps/icu.git' + '@' + 'd888fd2a1be890f4d35e43f68d6d79f42519a357',
 
   'src/third_party/jsoncpp/source':
     Var('chromium_git') + '/external/github.com/open-source-parsers/jsoncpp.git' + '@' + 'f572e8e42e22cfcf5ab0aea26574f408943edfa4', # from svn 248