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}

src/flag-definitions.h

@@ -214,16 +214,23 @@ DEFINE_IMPLICATION(es_staging, move_object_start)
   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") \
-  V(icu_case_mapping, "case mapping with ICU rather than Unibrow")
+#define HARMONY_STAGED(V) \
+  HARMONY_STAGED_BASE(V)  \
+  V(datetime_format_to_parts, "Intl.DateTimeFormat.formatToParts")
 #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(V) V(harmony_async_await, "harmony async-await")
+#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
 
 // 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".
 
 
-FAIL String("A𐐀").toLowerCase() should be a𐐨. Was a𐐀.
-FAIL String("a𐐨").toUpperCase() should be A𐐀. Was A𐐨.
+PASS String("A𐐀").toLowerCase() is "a𐐨"
+PASS String("a𐐨").toUpperCase() is "A𐐀"
 PASS String("ΚΟΣΜΟΣ ΚΟΣΜΟΣ").toLowerCase() is "κοσμος κοσμος"
 PASS String("ß").toUpperCase() is "SS"
 PASS String("ʼn").toUpperCase() is "ʼN"