Roll ICU to 0b6134378

CherryPick fractional second bugs from ICU.

https://chromium.googlesource.com/chromium/deps/icu.git/+log/9f4020916..0b6134378

Including the following changes

0b61343 Fix fractional second bug by Frank Tang · 16 minutes ago master
49ee7b1 Make it able to optionally disable thin_archive by Honglin Yu · 9 days ago
f9a6fc2 Revert "Add flag for compiling into shared libraries." by Honglin Yu · 9 days ago
eb405d8 Add flag for compiling into shared libraries. by Honglin Yu · 4 weeks ago

BUG=chromium:1020393, v8:9284, v8:9612, v8:10273

Change-Id: I94692734fe29e783293ec7c98b69ccd8d879b804
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2090002Reviewed-by: Jungshik Shin <jshin@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747563}

DEPS

@@ -1035,7 +1035,7 @@ deps = {
     Var('chromium_git') + '/chromium/deps/hunspell_dictionaries.git' + '@' + 'e96f230bf759bfe46125ca92e0aa3fe72d9f0227',
 
   'src/third_party/icu':
-    Var('chromium_git') + '/chromium/deps/icu.git' + '@' + '49ee7b1d18c88676f77e8316f604bc6f89af9cb1',
+    Var('chromium_git') + '/chromium/deps/icu.git' + '@' + '0b6134378c4b96a7854ff366dd706f5b9b502929',
 
   'src/third_party/icu4j': {
       'packages': [