Revert of Turn on icu_case_mapping by default (patchset #3 id:40001 of...

Revert of Turn on icu_case_mapping by default (patchset #3 id:40001 of https://codereview.chromium.org/2588963002/ )

Reason for revert:
Causes gc stress failures:
https://build.chromium.org/p/client.v8/builders/V8%20Linux64%20GC%20Stress%20-%20custom%20snapshot/builds/9920

Original issue's description:
> Turn on icu_case_mapping by default
>
> BUG=v8:4477, v8:4476
> TEST=test262/{built-ins,intl402}/Strings/*, webkit/fast/js/*,
>      mjsunit/string-case, intl/general/case*
>
> Review-Url: https://codereview.chromium.org/2588963002
> Cr-Commit-Position: refs/heads/master@{#41834}
> Committed: https://chromium.googlesource.com/v8/v8/+/7c79e23c34ea971947eedc6e42d8a882617c0e47

TBR=littledan@chromium.org,yangguo@chromium.org,jshin@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4477, v8:4476

Review-Url: https://codereview.chromium.org/2593543002
Cr-Commit-Position: refs/heads/master@{#41835}

src/flag-definitions.h

@@ -216,21 +216,14 @@ DEFINE_IMPLICATION(es_staging, move_object_start)
 #ifdef V8_I18N_SUPPORT
 #define HARMONY_STAGED(V)                                          \
   HARMONY_STAGED_BASE(V)                                           \
-  V(datetime_format_to_parts, "Intl.DateTimeFormat.formatToParts")
+  V(datetime_format_to_parts, "Intl.DateTimeFormat.formatToParts") \
+  V(icu_case_mapping, "case mapping with ICU rather than Unibrow")
 #else
 #define HARMONY_STAGED(V) HARMONY_STAGED_BASE(V)
 #endif
 
 // Features that are shipping (turned on by default, but internal flag remains).
-#define HARMONY_SHIPPING_BASE(V) V(harmony_async_await, "harmony async-await")
-
-#ifdef V8_I18N_SUPPORT
-#define HARMONY_SHIPPING(V) \
-  HARMONY_SHIPPING_BASE(V)  \
-  V(icu_case_mapping, "case mapping with ICU rather than Unibrow")
-#else
-#define HARMONY_SHIPPING(V) HARMONY_SHIPPING_BASE(V)
-#endif
+#define HARMONY_SHIPPING(V) V(harmony_async_await, "harmony async-await")
 
 // Once a shipping feature has proved stable in the wild, it will be dropped
 // from HARMONY_SHIPPING, all occurrences of the FLAG_ variable are removed,

test/webkit/fast/js/string-capitalization-expected.txt

@@ -26,8 +26,8 @@ This test checks that toLowerCase and toUpperCase handle certain non-trivial cas
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
-PASS String("A𐐀").toLowerCase() is "a𐐨"
-PASS String("a𐐨").toUpperCase() is "A𐐀"
+FAIL String("A𐐀").toLowerCase() should be a𐐨. Was a𐐀.
+FAIL String("a𐐨").toUpperCase() should be A𐐀. Was A𐐨.
 PASS String("ΚΟΣΜΟΣ ΚΟΣΜΟΣ").toLowerCase() is "κοσμος κοσμος"
 PASS String("ß").toUpperCase() is "SS"
 PASS String("ʼn").toUpperCase() is "ʼN"