Roll src/third_party/icu/ 79326efe2..aef20f06d (6 commits)

https://chromium.googlesource.com/chromium/deps/icu.git/+log/79326efe26e5..aef20f06d47b

$ git log 79326efe2..aef20f06d --date=short --no-merges --format='%ad %ae %s'
2020-09-17 mukai Fix the build config regarding icu_disable_thin_archive
2020-09-22 zarvox [build] Clean up no_rtti config handling
2020-09-16 hidehiko icu: Expand is_linux to is_linux || is_chromeos.
2020-09-11 fdegans [fuchsia] Bring more changes from the Fuchsia copy
2020-09-01 fdegans Upstream Fuchsia changes in build file
2020-06-29 adetaylor Add CPEPrefix.

Created with:
  roll-dep src/third_party/icu

Bug: 1129473
Change-Id: I4a97eb577118be241dd9f8f1306439c6d1eaec29
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2425287Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Commit-Queue: Jun Mukai <mukai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809695}

DEPS

@@ -1032,7 +1032,7 @@ deps = {
     Var('chromium_git') + '/chromium/deps/hunspell_dictionaries.git' + '@' + '18e09b9197a3b1d771c077c530d1a4ebad04c167',
 
   'src/third_party/icu':
-    Var('chromium_git') + '/chromium/deps/icu.git' + '@' + '79326efe26e5440f530963704c3c0ff965b3a4ac',
+    Var('chromium_git') + '/chromium/deps/icu.git' + '@' + 'aef20f06d47ba76fdf13abcdb033e2a408b5a94d',
 
   'src/third_party/icu4j': {
       'packages': [