Roll ICU e4c3143982:10834e84d2

Add an API to detect the host timezone to ICU. See

  https://chromium.googlesource.com/chromium/deps/icu/+log/e4c3143982..10834e84d2

BUG=406382
TEST=None
TBR=mark@chromium.org

Review URL: https://codereview.chromium.org/1065723002

Cr-Commit-Position: refs/heads/master@{#323980}

DEPS

@@ -138,7 +138,7 @@ deps = {
    Var('chromium_git') + '/chromium/blink.git' + '@' +  Var('webkit_revision'),
 
   'src/third_party/icu':
-   Var('chromium_git') + '/chromium/deps/icu.git' + '@' + 'e4c31439828d356525b71ef81a6d61ea50d7d673',
+   Var('chromium_git') + '/chromium/deps/icu.git' + '@' + '10834e84d250eb31a73496bfdb7923eaa43ead51',
 
   'src/third_party/libexif/sources':
    Var('chromium_git') + '/chromium/deps/libexif/sources.git' + '@' + 'ed98343daabd7b4497f97fda972e132e6877c48a',