Revert "Roll ICU to 67.1 f2223961"

This reverts commit db2cb995.

Reason for revert: caused 30ms startup performance regression on Windows

Original change's description:
> Roll ICU to 67.1 f2223961
> 
> ICU 67.1 release notes: http://site.icu-project.org/download/67
> ICU 66.1 release notes: http://site.icu-project.org/download/66
> CLDR 37: release notes: http://blog.unicode.org/2020/04/unicode-locale-data-v37-released_23.html
> 
> 1. Update to 67-1
>    Diary https://docs.google.com/document/d/1ZDtSPa3ZkzBIJmqrDVmGmyrTihjx8Me4fKQoQcBj02E/edit#
> 
> Size changes:
>   65-1 .   67-1
>  7786368  7778704 android/icudtl.dat
>  6412768  6400752 android_small/icudtl.dat
>  1418320  1430976 android_small/icudtl_extra.dat
>  5060880  5048912 cast/icudtl.dat
> 10481632 10470736 chromeos/icudtl.dat
> 10506736 10498032 common/icudtb.dat
> 10506736 10498032 common/icudtl.dat
>   900576 . 898416 flutter/icudtl.dat
>  6375984  6363968 ios/icudtl.dat
> 
> 
> Bug: 1064326, 827538
> Change-Id: I169e1f99514b36cafd54a6bc8a9914ccf222d008
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2155530
> Reviewed-by: Koji Ishii <kojii@chromium.org>
> Commit-Queue: Frank Tang <ftang@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#764138}

TBR=machenbach@chromium.org,kojii@chromium.org,jshin@chromium.org,ftang@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1064326, 827538, 1080367
Change-Id: I98ebe6e01631b10ecc1955ac9d3bc53be11e23c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2209232
Commit-Queue: Mike Wittman <wittman@chromium.org>
Reviewed-by: Mike Wittman <wittman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771137}

DEPS

@@ -1007,7 +1007,7 @@ deps = {
     Var('chromium_git') + '/chromium/deps/hunspell_dictionaries.git' + '@' + '6fdad5388130757e1efb58a14b8e7f9494625691',
 
   'src/third_party/icu':
-    Var('chromium_git') + '/chromium/deps/icu.git' + '@' + 'f2223961702f00a8833874b0560d615a2cc42738',
+    Var('chromium_git') + '/chromium/deps/icu.git' + '@' + '84e9d0035875f383b98320d48f3e7008a23c3738',
 
   'src/third_party/icu4j': {
       'packages': [