Bug 671976 - Allow for up to two occurrences of this assertion on Windows.

layout/base/tests/chrome/test_printpreview_bug482976.xul

@@ -19,8 +19,7 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=482976
 if (navigator.platform.startsWith("Linux")) {
   SimpleTest.expectAssertions(1); // bug 671976
 } else if (navigator.platform.startsWith("Win")) {
-  // reliable 1 on Win7, but not on XP
-  SimpleTest.expectAssertions(0, 1); // bug 671976
+  SimpleTest.expectAssertions(0, 2); // bug 671976
 }
 
 SimpleTest.waitForExplicitFinish();