Disable flaky TopDocumentIsolationTest.NavigateToSubframeSiteWithPopup2 on Mac

content/browser/top_document_isolation_browsertest.cc

Index: content/browser/top_document_isolation_browsertest.cc
diff --git a/content/browser/top_document_isolation_browsertest.cc b/content/browser/top_document_isolation_browsertest.cc
index dd4541f23185caed04f5107cef2316f837af94ba..31ce75ae998e83d04ba7d14c00a0d04a5e6b9049 100644
--- a/content/browser/top_document_isolation_browsertest.cc
+++ b/content/browser/top_document_isolation_browsertest.cc
@@ -278,8 +278,16 @@ IN_PROC_BROWSER_TEST_F(TopDocumentIsolationTest,
       DepictFrameTree(root()));
 }
 
+// Flaky on Mac. See http://crbug.com/611300.
+#if defined(OS_MACOSX)
+#define MAYBE_NavigateToSubframeSiteWithPopup2 \
+    DISABLED_NavigateToSubframeSiteWithPopup2
+#else
+#define MAYBE_NavigateToSubframeSiteWithPopup2 NavigateToSubframeSiteWithPopup2
+#endif
+
 IN_PROC_BROWSER_TEST_F(TopDocumentIsolationTest,
-                       NavigateToSubframeSiteWithPopup2) {
+                       MAYBE_NavigateToSubframeSiteWithPopup2) {
   if (content::AreAllSitesIsolatedForTesting())
     return;  // Top Document Isolation is disabled in this mode.