Roll src/third_party/icu/ 5005010d6..b51014b96 (1 commit)

https://chromium.googlesource.com/chromium/deps/icu.git/+log/5005010d694e..b51014b96251

$ git log 5005010d6..b51014b96 --date=short --no-merges --format='%ad %ae %s'
2019-10-21 caraitto Add a fuzzer for UnicodeStringAppendable.

Created with:
  roll-dep src/third_party/icu

Bug: 1009107
Change-Id: I9da089cf6629a73458ce89c18f252a3a9b2cabdf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872810Reviewed-by: Max Moroz <mmoroz@chromium.org>
Commit-Queue: Caleb Raitto <caraitto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708346}

DEPS

@@ -1054,7 +1054,7 @@ deps = {
     Var('chromium_git') + '/chromium/deps/hunspell_dictionaries.git' + '@' + '681ca92480ecc11d35feae8c1c00e4e035630f43',
 
   'src/third_party/icu':
-    Var('chromium_git') + '/chromium/deps/icu.git' + '@' + '5005010d694e16571b8dfbf07d70817841f80a69',
+    Var('chromium_git') + '/chromium/deps/icu.git' + '@' + 'b51014b96251d1a0194db61a2aa36eb216daf43c',
 
   'src/third_party/icu4j': {
       'packages': [