Revert 168553 "id of iframe incorrectly sets window name"

trunk/LayoutTests/http/tests/security/sandboxed-iframe-blocks-access-from-parent.html

Index: trunk/LayoutTests/http/tests/security/sandboxed-iframe-blocks-access-from-parent.html
===================================================================
--- trunk/LayoutTests/http/tests/security/sandboxed-iframe-blocks-access-from-parent.html	(revision 168578)
+++ trunk/LayoutTests/http/tests/security/sandboxed-iframe-blocks-access-from-parent.html	(working copy)
@@ -8,9 +8,9 @@
         }
 
         function test() {
-            var testFrameWindow = window.frames['testframe'];
+            var test = document.getElementById('testframe');
             try {
-                var location = testFrameWindow.location.href;
+                var location = test.contentWindow.location.href;
             } catch (e) {
                 alert("PASS: Cross-origin access to the Location object threw an exception.");
             }
@@ -23,6 +23,6 @@
     containing document shouldn't have script access to. This test passes if an
     exception is thrown upon the access violation.</p>
 
-    <iframe src="resources/blank.html" name="testframe" sandbox onload="test();"></iframe>
+    <iframe src="resources/blank.html" id="testframe" sandbox onload="test();"></iframe>
 </body>
 </html>