Disable flaky TopDocumentIsolationTest.NavigateToSubframeSiteWithPopup2 on Mac

content/browser/top_document_isolation_browsertest.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <string>
 
 #include "base/command_line.h"
 #include "content/browser/frame_host/frame_tree_node.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/public/common/content_switches.h"
@@ skipping 260 matching lines @@
   EXPECT_EQ(
       " Site D\n"
       "   |--Site D\n"
       "   |--Site D\n"
       "   |--Site D\n"
       "   +--Site D\n"
       "Where D = http://c.com/",
       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.
 
   // A(B, C) -> C(A, B), but while a separate C(A) popup exists.
   //
   // This test is constructed so that c.com is the second site to commit in the
   // default subframe SiteInstance, so the default subframe SiteInstance does
   // not have a "c.com" as the value of GetSiteURL().
   GURL abb_url(embedded_test_server()->GetURL(
       "a.com", "/cross_site_iframe_factory.html?a(b, b)"));
@@ skipping 269 matching lines @@
       "      C = http://adnetwork.com/",
       DepictFrameTree(root()));
   EXPECT_EQ(
       " Site C ------------ proxies for B\n"
       "Where B = default subframe process\n"
       "      C = http://adnetwork.com/",
       DepictFrameTree(popup_root));
 }
 
 }  // namespace content