Disable BookmarkBarNavigationTest.SecFetchSiteNoneFromNonEmptyTab on Windows

This test is flakily failing on Windows bots.
https://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=BookmarkBarNavigationTest.SecFetchSiteNoneFromNonEmptyTab

TBR=mkwst@chromium.org

Bug: 1006033
Change-Id: I72fa0c6baf009873850b7043d36d009bb6020e03
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1818014Reviewed-by: Alan Cutter <alancutter@chromium.org>
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699235}

chrome/browser/ui/views/bookmarks/bookmark_bar_view_browsertest.cc

@@ -163,8 +163,8 @@ IN_PROC_BROWSER_TEST_F(BookmarkBarNavigationTest, SecFetchFromEmptyTab) {
   }
 }
 
-#if defined(OS_MACOSX)
-//  TODO(crbug.com/1006033): Test flaky on MAC
+#if defined(OS_MACOSX) || defined(OS_WIN)
+//  TODO(crbug.com/1006033): Test flaky on Mac and Windows.
 #define MAYBE_SecFetchSiteNoneFromNonEmptyTab \
   DISABLED_SecFetchSiteNoneFromNonEmptyTab
 #else