Revert of Turn on icu_case_mapping by default

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

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 This test checks that toLowerCase and toUpperCase handle certain non-trivial cases correctly.
 
 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"
 PASS String("ǰ").toUpperCase() is "J̌"
 PASS String("ffi").toUpperCase() is "FFI"
 PASS String("FFI").toLowerCase() is "ffi"
 PASS String("IJ").toLowerCase() is "ij"
 PASS expected[String.fromCharCode(0xA78D).toLowerCase()] is true
 PASS expected[String.fromCharCode(0x0265).toUpperCase()] is true
 PASS expected[String.fromCharCode(0x10C7).toLowerCase()] is true
 PASS expected[String.fromCharCode(0x2D27).toUpperCase()] is true
 PASS expected[String.fromCharCode(0x2D2D).toLowerCase()] is true
 PASS expected[String.fromCharCode(0x10CD).toUpperCase()] is true
 PASS expected[String.fromCharCode(0x2CF2).toLowerCase()] is true
 PASS expected[String.fromCharCode(0x2CF3).toUpperCase()] is true
 PASS expected[String.fromCharCode(0xA792).toLowerCase()] is true
 PASS expected[String.fromCharCode(0xA793).toUpperCase()] is true
 PASS expected[String.fromCharCode(0xA7AA).toLowerCase()] is true
 PASS expected[String.fromCharCode(0x0266).toUpperCase()] is true
 PASS successfullyParsed is true
 
 TEST COMPLETE