Remove old tests that have been migrated to the v8 repo.

LayoutTests/fast/js/regexp-no-extensions-expected.txt

-Tests that regular expressions do not have extensions that diverge from the JavaScript specification. Because WebKit originally used a copy of PCRE, various non-JavaScript regular expression features were historically present. Also tests various related edge cases.
-
-On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
-
-
-PASS /\x{41}/.exec("yA1") is null
-PASS /[\x{41}]/.exec("yA1").toString() is "1"
-PASS /\x1g/.exec("x1g").toString() is "x1g"
-PASS /[\x1g]/.exec("x").toString() is "x"
-PASS /[\x1g]/.exec("1").toString() is "1"
-PASS /\2147483648/.exec(String.fromCharCode(140) + "7483648").toString() is String.fromCharCode(140) + "7483648"
-PASS /\4294967296/.exec("\"94967296").toString() is "\"94967296"
-FAIL /\8589934592/.exec("\\8589934592").toString() should be \8589934592. Was 8589934592.
-PASS "\nAbc\n".replace(/(\n)[^\n]+$/, "$1") is "\nAbc\n"
-PASS /x$/.exec("x\n") is null
-PASS /x++/ threw exception SyntaxError: Invalid regular expression: /x++/: Nothing to repeat.
-PASS /[]]/.exec("]") is null
-
-Octal escape sequences are in Annex B of the standard.
-
-PASS /\060/.exec("y01").toString() is "0"
-PASS /[\060]/.exec("y01").toString() is "0"
-PASS /\606/.exec("y06").toString() is "06"
-PASS /[\606]/.exec("y06").toString() is "0"
-PASS /[\606]/.exec("y6").toString() is "6"
-PASS /\101/.exec("yA1").toString() is "A"
-PASS /[\101]/.exec("yA1").toString() is "A"
-PASS /\1011/.exec("yA1").toString() is "A1"
-PASS /[\1011]/.exec("yA1").toString() is "A"
-PASS /[\1011]/.exec("y1").toString() is "1"
-PASS /\10q/.exec("y" + String.fromCharCode(8) + "q").toString() is String.fromCharCode(8) + "q"
-PASS /[\10q]/.exec("y" + String.fromCharCode(8) + "q").toString() is String.fromCharCode(8)
-PASS /\1q/.exec("y" + String.fromCharCode(1) + "q").toString() is String.fromCharCode(1) + "q"
-PASS /[\1q]/.exec("y" + String.fromCharCode(1) + "q").toString() is String.fromCharCode(1)
-PASS /[\1q]/.exec("yq").toString() is "q"
-FAIL /\8q/.exec("\\8q").toString() should be \8q. Was 8q.
-PASS /[\8q]/.exec("y8q").toString() is "8"
-PASS /[\8q]/.exec("yq").toString() is "q"
-PASS /(x)\1q/.exec("xxq").toString() is "xxq,x"
-PASS /(x)[\1q]/.exec("xxq").toString() is "xq,x"
-PASS /(x)[\1q]/.exec("xx" + String.fromCharCode(1)).toString() is "x" + String.fromCharCode(1) + ",x"
-
-PASS successfullyParsed is true
-
-TEST COMPLETE
-