Migrate more tests from blink repository.

test/webkit/fast/js/regexp-non-capturing-groups-expected.txt

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-Test to ensure correct behaviour of Object.keys
+Test for behavior of non-capturing groups, as described in a blog post by Steven Levithan and bug 14931.
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
-PASS Object.keys({}) is []
-PASS Object.keys({a:null}) is ['a']
-PASS Object.keys({a:null, b:null}) is ['a', 'b']
-PASS Object.keys({b:null, a:null}) is ['b', 'a']
-PASS Object.keys([]) is []
-PASS Object.keys([null]) is ['0']
-PASS Object.keys([null,null]) is ['0','1']
-PASS Object.keys([null,null,,,,null]) is ['0','1','5']
-PASS Object.keys({__proto__:{a:null}}) is []
-PASS Object.keys({__proto__:[1,2,3]}) is []
-PASS x=[];x.__proto__=[1,2,3];Object.keys(x) is []
+PASS /(x)?\1y/.test("y") is true
+PASS /(x)?\1y/.exec("y") is ["y", undefined]
+PASS /(x)?y/.exec("y") is ["y", undefined]
+PASS "y".match(/(x)?\1y/) is ["y", undefined]
+PASS "y".match(/(x)?y/) is ["y", undefined]
+PASS "y".match(/(x)?\1y/g) is ["y"]
+PASS "y".split(/(x)?\1y/) is ["", undefined, ""]
+PASS "y".split(/(x)?y/) is ["", undefined, ""]
+PASS "y".search(/(x)?\1y/) is 0
+PASS "y".replace(/(x)?\1y/, "z") is "z"
+PASS "y".replace(/(x)?y/, "$1") is ""
+PASS "y".replace(/(x)?\1y/, function($0, $1){ return String($1); }) is "undefined"
+PASS "y".replace(/(x)?y/, function($0, $1){ return String($1); }) is "undefined"
+PASS "y".replace(/(x)?y/, function($0, $1){ return $1; }) is "undefined"
 PASS successfullyParsed is true
 
 TEST COMPLETE