Revert "Reland "Roll ICU to 67.1""

This reverts commit c9b650e1.

Reason for revert: https://crbug.com/1087751

Original change's description:
> Reland "Roll ICU to 67.1"
> 
> This reverts commit d90baa9e.
> 
> Reason for revert: reland ICU67.1 after #if 0 the problematic new code
> 
> Fix in 630b884f84d
> 
> Original change's description:
> > 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}
> 
> TBR=wittman@chromium.org,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: I6d255bac08a68d6716ac51d84765acc010c6a10d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2220363
> Reviewed-by: Mike Wittman <wittman@chromium.org>
> Commit-Queue: Frank Tang <ftang@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#773036}

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

Change-Id: I62514ad0a6c270f8099e4a473e31f93d3ee7619a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1064326, 827538, 1080367, 1087751
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2217839Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773082}

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' + '@' + '630b884f84d1d5e92aeda3463dca99fe2befd30e',
+    Var('chromium_git') + '/chromium/deps/icu.git' + '@' + '84e9d0035875f383b98320d48f3e7008a23c3738',
 
   'src/third_party/icu4j': {
       'packages': [