Migrate more tests from blink repository.

test/webkit/fast/js/toString-exception.js

Index: test/webkit/fast/js/toString-exception.js
diff --git a/test/webkit/instanceof-operator.js b/test/webkit/fast/js/toString-exception.js
similarity index 81%
copy from test/webkit/instanceof-operator.js
copy to test/webkit/fast/js/toString-exception.js
index 1230181584337c86a13846618b2cefe510239e59..2a8b50c0fdd080deeb9a8115a04b9d3680bea08b 100644
--- a/test/webkit/instanceof-operator.js
+++ b/test/webkit/fast/js/toString-exception.js
@@ -22,12 +22,22 @@
 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 description(
-"instanceof test"
+'This test checks for regression against <a href="https://bugs.webkit.org/show_bug.cgi?id=7343">7343: REGRESSION: fast/js/toString-overrides.html fails when run multiple times</a>.'
 );
 
-getterCalled = false;
+var a = [{ toString : 0 }];
+
 try {
-    ({} instanceof { get prototype(){ getterCalled = true; } });
+    a.toString();
 } catch (e) {
 }
-shouldBeFalse("getterCalled");
+
+var caught = false;
+
+try {
+  a.toString();
+} catch (e) {
+caught = true;
+}
+
+shouldBeTrue("caught");