Bug 1092388 - Remove cross-origin document.write test. r=bz

This test is pretty bogus. It uses enablePrivilege and then tries to test
various document.write behaviors across origins.

This test in general is pretty terrible. I spent a while trying to improve it,
got frustrated, was tempted to remove the whole thing, and then finally settled
on this as the path of least resistance.

dom/tests/mochitest/bugs/test_bug346659.html

@@ -21,7 +21,7 @@
 // do the tests in two batches, because otherwise the popup blocker kills off
 // our test because it opens too many windows.
 var numTestsSet1 = 6;
-var numTestsSet2 = 4;
+var numTestsSet2 = 2;
 var numTestsSet3 = 2;
 var complete = 0;
 SimpleTest.waitForExplicitFinish();
@@ -173,9 +173,7 @@
 function startSecondBatch() {
   var baseurl = window.location.href.replace(/mochi\.test:8888/, "example.com");
   wins[7] = window.open(r(baseurl, 'bug346659-opener.html?{"load":7}'));
-  wins[8] = window.open(r(baseurl, 'bug346659-opener.html?{"write":8}'));
   wins[9] = window.open(r(baseurl, 'bug346659-parent.html?{"load":9}'));
-  wins[10] = window.open(r(baseurl, 'bug346659-parent.html?{"write":10}'));
 }
 
 function startThirdBatch() {