[M71] Revert "Fix the timezone detection on Windows with RDP."

This reverts commit ccad447 in M71
branch.

There's an issue with DST detection so that we revert it in M71 branch.
For M72 or later, we'll find a better fix.

> Fix the timezone detection on Windows with RDP.
>
> This is to cherry-pick fixes from the upstream to fix
> the timezone detection issue when a remote Windows
> session is used. The detected timezone should be that of
> a remote machine Chrome is running on, but without this
> fix, it uses the timezone of machine where a RDP connection
> originates.
>
> Bugs:
>
> https://unicode-org.atlassian.net/browse/ICU-13842
> https://unicode-org.atlassian.net/browse/ICU-13827
>
> Fixes (included in the upstream ICU 63 release candidate)
> unicode-org/icu#55
> unicode-org/icu#129
>
> TBR=yangguo@chromium.org
> Bug: 854387
> Test: Manual. See the bug
> Change-Id: Ic21e82987c1569e107d9b5e17bdc0d21e65fda3c
> Reviewed-on: https://chromium-review.googlesource.com/c/1270635

Bug: 854387, 913298

README.chromium

@@ -289,17 +289,7 @@ D. Local Modifications
     https://unicode-org.atlassian.net/browse/ICU-20140
   - fix: https://github.com/unicode-org/icu/pull/136
 
-15. Cherry pick an upstream patch for Windows timezone detection
-
-  - patches/wintz_detection.patch
-  - upstream bugs:
-    https://unicode-org.atlassian.net/browse/ICU-13842
-    https://unicode-org.atlassian.net/browse/ICU-13827
-  - fixes:
-      https://github.com/unicode-org/icu/pull/55
-      https://github.com/unicode-org/icu/pull/129
-
-16. Align memory buffer used in UnicodeSet on ARM.
+15. Align memory buffer used in UnicodeSet on ARM.
 
   - patches/arm_align.patch
   - upstream bug: