[regexp] remove no-op RegExp.multiline accessor and alias

test/mjsunit/regexp-static.js

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 126 matching lines @@
   re_text += "(?:a(x))?";
   haystack += "bx";
   var re = new RegExp(re_text);
   assertTrue(re.test(haystack), "$" + i + " setup");
   for (var j = 1; j < i - 1; j++) {
     assertEquals("x", RegExp['$' + j], "$" + j + " in $" + i + " setup");
   }
   assertEquals("", RegExp['$' + (i)], "$" + i);
 }
 
-RegExp.multiline = "foo";
-assertTrue(typeof RegExp.multiline == typeof Boolean(), "RegExp.multiline coerces values to booleans");
 RegExp.input = Number();
 assertTrue(typeof RegExp.input == typeof String(), "RegExp.input coerces values to booleans");
 
 // Ensure that we save the correct string as the last subject when
 // we do a match on a sliced string (the top one not the underlying).
 var foo = "lsdfj sldkfj sdklfj læsdfjl sdkfjlsdk fjsdl fjsdljskdj flsj flsdkj flskd regexp: /foobar/\nldkfj sdlkfj sdkl";
 assertTrue(/^([a-z]+): (.*)/.test(foo.substring(foo.indexOf("regexp:"))), "regexp: setup");
 assertEquals("regexp", RegExp.$1, "RegExp.$1");
 
 
 // Check that calling with no argument is the same as calling with undefined.
 assertTrue(/^undefined$/.test());
 assertEquals(["undefined"], /^undefined$/.exec());