Revert of Turn on icu_case_mapping by default

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index fdd5be43115b4b1da6d04c4a12e6701332727987..06811a2d7b87668936f865c4938eb3cbe1c3e30b 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -214,23 +214,16 @@
   V(harmony_string_padding, "harmony String-padding methods")
 
 #ifdef V8_I18N_SUPPORT
-#define HARMONY_STAGED(V) \
-  HARMONY_STAGED_BASE(V)  \
-  V(datetime_format_to_parts, "Intl.DateTimeFormat.formatToParts")
+#define HARMONY_STAGED(V)                                          \
+  HARMONY_STAGED_BASE(V)                                           \
+  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,