Disable flaky DumpAccessibilityTreeTest.AccessibilityModalDialogInIframeOpened on mac

content/browser/accessibility/dump_accessibility_tree_browsertest.cc

 // Copyright (c) 2012 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 <set>
 #include <string>
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/path_service.h"
@@ skipping 1098 matching lines @@
 IN_PROC_BROWSER_TEST_F(DumpAccessibilityTreeTest,
                        AccessibilityModalDialogClosed) {
   RunHtmlTest(FILE_PATH_LITERAL("modal-dialog-closed.html"));
 }
 
 IN_PROC_BROWSER_TEST_F(DumpAccessibilityTreeTest,
                        AccessibilityModalDialogOpened) {
   RunHtmlTest(FILE_PATH_LITERAL("modal-dialog-opened.html"));
 }
 
-// Flaky on Windows: crbug.com/593846
-#if defined(OS_WIN)
+// Flaky on Windows and Mac: crbug.com/593846
+#if defined(OS_WIN) || defined(OS_MACOSX)
 #define MAYBE_AccessibilityModalDialogInIframeClosed \
     DISABLED_AccessibilityModalDialogInIframeClosed
 #else
 #define MAYBE_AccessibilityModalDialogInIframeClosed \
     AccessibilityModalDialogInIframeClosed
 #endif
 IN_PROC_BROWSER_TEST_F(DumpAccessibilityTreeTest,
                        MAYBE_AccessibilityModalDialogInIframeClosed) {
   RunHtmlTest(FILE_PATH_LITERAL("modal-dialog-in-iframe-closed.html"));
 }
 
-// Flaky on Windows: crbug.com/593846
-#if defined(OS_WIN)
+// Flaky on Windows and Mac: crbug.com/593846
+#if defined(OS_WIN) || defined(OS_MACOSX)
 #define MAYBE_AccessibilityModalDialogInIframeOpened \
     DISABLED_AccessibilityModalDialogInIframeOpened
 #else
 #define MAYBE_AccessibilityModalDialogInIframeOpened \
     AccessibilityModalDialogInIframeOpened
 #endif
 IN_PROC_BROWSER_TEST_F(DumpAccessibilityTreeTest,
                        MAYBE_AccessibilityModalDialogInIframeOpened) {
   RunHtmlTest(FILE_PATH_LITERAL("modal-dialog-in-iframe-opened.html"));
 }
@@ skipping 168 matching lines @@
 // crbug.com/281952
 IN_PROC_BROWSER_TEST_F(DumpAccessibilityTreeTest, DISABLED_AccessibilityVideo) {
   RunHtmlTest(FILE_PATH_LITERAL("video.html"));
 }
 
 IN_PROC_BROWSER_TEST_F(DumpAccessibilityTreeTest, AccessibilityWbr) {
   RunHtmlTest(FILE_PATH_LITERAL("wbr.html"));
 }
 
 }  // namespace content