Use ICU case conversion/transliterator for case conversion behind a flag

test/intl/testcfg.py

Index: test/intl/testcfg.py
diff --git a/test/intl/testcfg.py b/test/intl/testcfg.py
index 51fa1e1a88d2fe2b350be8b7b16f1db62b9bed88..d7ee936a769056ea00c8d03f0ae4e3c70299500d 100644
--- a/test/intl/testcfg.py
+++ b/test/intl/testcfg.py
@@ -54,7 +54,8 @@ class IntlTestSuite(testsuite.TestSuite):
     return tests
 
   def GetFlagsForTestCase(self, testcase, context):
-    flags = ["--allow-natives-syntax"] + context.mode_flags
+    flags = ["--allow_natives_syntax", "--icu_case_mapping"] + \
+        context.mode_flags
 
     files = []
     files.append(os.path.join(self.root, "assert.js"))