Throw exceptions on all failed cross-origin access checks.

LayoutTests/http/tests/security/resources/cross-frame-access.js

 function log(s)
 {
     document.getElementById("console").appendChild(document.createTextNode(s + "\n"));
 }
 
 function shouldBe(a, b, shouldNotPrintValues)
 {
     var evalA, evalB;
     try {
         evalA = eval(a);
@@ skipping 40 matching lines @@
 
 function canGet(keyPath)
 {
     try {
         return eval("window." + keyPath) !== undefined;
     } catch(e) {
         return false;
     }
 }
 
+function shouldThrowException(a) {
+    try {
+        var evalA = eval(e);
+        log("FAIL: " + a + " should have thrown an exception, but instead returned " + evalA + ".");
+        return false;
+    } catch (e) {
+        log("PASS: " + a + " should have thrown an exception, and did.");
+        return true;
+    }
+}
+
 function accessThrowsException(keyPath) {
     try {
         eval("window." + keyPath);
         return false;
     } catch (e) {
         return true;
     }
 }
 
 function deletionThrowsException(keyPath) {
@@ skipping 147 matching lines @@
     function doneHandler() {
         if (win.closed) {
             if (window.testRunner)
                 testRunner.notifyDone();
             return;
         }
 
         setTimeout(doneHandler, 5);
     }
 }