Roll ICU to d6530149

It has one change to update the IANA timezone database to 2018i.

See
 https://chromium-review.googlesource.com/c/1395498

for details.

TBR=gsathya@chromium.org

Bug: 473288
Test: See the CL description at https://crrev.com/c/1395498
Change-Id: Idefb26be5852a4839a0a6d8cf062b09815b626a4
Reviewed-on: https://chromium-review.googlesource.com/c/1396231Reviewed-by: Jungshik Shin <jshin@chromium.org>
Commit-Queue: Jungshik Shin <jshin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619973}

DEPS

@@ -845,7 +845,7 @@ deps = {
     Var('chromium_git') + '/chromium/deps/hunspell_dictionaries.git' + '@' + 'a9bac57ce6c9d390a52ebaad3259f5fdb871210e',
 
   'src/third_party/icu':
-    Var('chromium_git') + '/chromium/deps/icu.git' + '@' + '23de01679d298bf9fb964ebede32f2157729ba96',
+    Var('chromium_git') + '/chromium/deps/icu.git' + '@' + 'd65301491c513d49163ad29c853eb85c02c8d5b4',
 
   'src/third_party/icu4j': {
       'packages': [