Disable the DeletePluginInDeallocate test on Mac.

chrome/test/ui/npapi_uitest.cc

 // Copyright (c) 2011 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 "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <comutil.h>
 #include <shellapi.h>
 #include <shlobj.h>
@@ skipping 142 matching lines @@
 TEST_F(NPAPIVisiblePluginTester, SelfDeletePluginInNewStream) {
   show_window_ = true;
   const FilePath test_case(FILE_PATH_LITERAL("self_delete_plugin_stream.html"));
   GURL url = ui_test_utils::GetTestUrl(FilePath(kTestDir), test_case);
   ASSERT_NO_FATAL_FAILURE(NavigateToURL(url));
   WaitForFinish("self_delete_plugin_stream", "1", url,
                 kTestCompleteCookie, kTestCompleteSuccess,
                 TestTimeouts::action_max_timeout_ms());
 }
 
-TEST_F(NPAPIVisiblePluginTester, DeletePluginInDeallocate) {
+// http://crbug.com/95558
+// This test fails frequently on Mac, so it is disabled for now.
+#if defined(OS_MACOSX)
+#define MAYBE_DeletePluginInDeallocate DISABLED_DeletePluginInDeallocate
+#else
+#define MAYBE_DeletePluginInDeallocate DeletePluginInDeallocate
+#endif
+TEST_F(NPAPIVisiblePluginTester, MAYBE_DeletePluginInDeallocate) {
   show_window_ = true;
   const FilePath test_case(
       FILE_PATH_LITERAL("plugin_delete_in_deallocate.html"));
   GURL url = ui_test_utils::GetTestUrl(FilePath(kTestDir), test_case);
   ASSERT_NO_FATAL_FAILURE(NavigateToURL(url));
   WaitForFinish("delete_plugin_in_deallocate_test", "signaller", url,
                 kTestCompleteCookie, kTestCompleteSuccess,
                 TestTimeouts::action_max_timeout_ms());
 }
 
@@ skipping 263 matching lines @@
   ASSERT_TRUE(tab->LoadBlockedPlugins());
 
   WaitForFinish("setup", "1", url, kTestCompleteCookie,
                 kTestCompleteSuccess, TestTimeouts::action_max_timeout_ms());
 
   ASSERT_TRUE(tab->ExecuteJavaScript("window.inject()"));
 
   WaitForFinish("setup", "2", url, kTestCompleteCookie,
                 kTestCompleteSuccess, TestTimeouts::action_max_timeout_ms());
 }