Throw exceptions on all failed cross-origin access checks.

LayoutTests/http/tests/security/xss-eval.html

 <p>This page verifies that you can't use eval to subvert cross-domain checks.</p>
 <p>If the test passes, you'll see a pass message below.</p>
 <hr>
 <pre id="console"></pre>
 
 <iframe style="width:0; height: 0" src="resources/xss-eval2.html"></iframe>
 
 <script>
 if (window.testRunner) {
     testRunner.dumpAsText();
@@ skipping 24 matching lines @@
         } catch(e) { return e.name; } })(), "It's me!")
 
     shouldBe("childEval.call(frames[0], 'document').testExpando",
         (function() { try {
             return childEval.call(frames[0], 'document').testExpando;
         } catch(e) { return e.name; } })(), "It's me too!");
 
     shouldBe("childEvalCaller('document').testExpando",
         (function() { try {
             return childEvalCaller('document').testExpando;
-        } catch(e) { return e.name; } })(), "TypeError");
+        } catch(e) { return e.name; } })(), "SecurityError");
 
     shouldBe("childLocalEvalCaller('document').testExpando",
         (function() { try { return childLocalEvalCaller('document').testExpando; } catch(e) { return e.name; } })(), "It's me too!");
 
     if (window.testRunner)
         testRunner.notifyDone();
 }, false);
 </script>