Migrate more tests from blink repository.

test/webkit/fast/js/array-float-delete.js

Index: test/webkit/fast/js/array-float-delete.js
diff --git a/test/webkit/array-tostring-and-join.js b/test/webkit/fast/js/array-float-delete.js
similarity index 84%
copy from test/webkit/array-tostring-and-join.js
copy to test/webkit/fast/js/array-float-delete.js
index b4fdb51b47f0b450a53fc725a133c27a21c5375d..e1e712edc659efe85d1845b8867996792b18c896 100644
--- a/test/webkit/array-tostring-and-join.js
+++ b/test/webkit/fast/js/array-float-delete.js
@@ -22,15 +22,11 @@
 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 description(
-
-"This test checks that toString and join share the same HashSet for visited elements."
-
+'This test checks for regression against <a href="https://bugs.webkit.org/show_bug.cgi?id=6234">6234: Can delete array index property incorrectly.</a>'
 );
 
-var arr = [1, 2];
-var obj = {};
-obj.__proto__.toString = function() { return "*" + arr + "*"; }
-arr[2] = arr;
-arr[3] = obj;
-
-shouldBe("arr.join()", "'1,2,,**'");
+var a = new Array();
+a[1]     = "before";
+a['1.0'] = "after";
+delete a['1.0'];
+shouldBe("a[1]", '"before"');