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

LayoutTests/fast/regex/assertion-expected.txt

-This page tests handling of parenthetical assertions.
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-On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
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-PASS regex1.exec('xx') is ['xx','x']
-PASS regex2.exec('baaabaac') is ['baaabaac','ba',undefined,'abaac']
-PASS regex3.exec('aaab') is ['aab','a','aab']
-PASS regex4.exec('aaab') is ['aab','a','aab']
-PASS regex5.exec('P11') is ['P11','1','1']
-PASS regex6.exec('ababbbcbc') is ['ababb','bb','b']
-PASS regex7.exec('xx') is ['xx','x']
-PASS regex8.exec('xx') is ['xx','x','x']
-PASS regex9.exec('xy') is null
-PASS regex10.exec('xy') is null
-PASS regex11.exec('xy') is null
-PASS regex12.exec('x') is null
-PASS regex12.exec('xx') is ['xx','x']
-PASS regex12.exec('xxy') is ['xx','x']
-PASS regex13.exec('xzzzx') is ['xzzzx','x']
-PASS regex13.exec('xzzzxy') is ['xzzzx','x']
-PASS regex14.exec('aabc') is ['aabc','a','bc']
-PASS regex14.exec('aabcx') is ['aabc','a','bc']
-PASS regex15.exec('aabc') is ['aabc','a','bc']
-PASS regex15.exec('aabcx') is ['aabc','a','bc']
-PASS regex16.exec('ab') is null
-PASS regex16.exec('abc') is ['abc','bc']
-PASS regex17.exec('ab') is ['a','ab']
-PASS regex17.exec('abc') is ['a','ab']
-PASS regex18.exec('x') is ['x','']
-PASS regex18.exec('xx') is ['x','xx']
-PASS regex18.exec('xxx') is ['x','xx']
-PASS regex19.exec('x') is ['x','',undefined]
-PASS regex19.exec('xx') is ['x','xx','xx']
-PASS regex19.exec('xxx') is ['x','xx','xx']
-PASS regex20.exec('x') is null
-PASS regex20.exec('xx') is ['x','xx']
-PASS regex20.exec('xxx') is ['x','xx']
-PASS regex21.exec('aab') is ['aab']
-PASS regex22.exec('55up') is null
-PASS regex23.exec('ax') is null
-PASS regex24.exec('x') is null
-PASS successfullyParsed is true
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-TEST COMPLETE
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