Correctly disable DownloadExtensionTest.DownloadExtensionTest_AcceptDanger on Mac.

chrome/browser/extensions/api/downloads/downloads_api_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.
 
 // Disable everything on windows only. http://crbug.com/306144
 #ifndef OS_WIN
 
 #include <algorithm>
 
 #include "base/files/file_util.h"
@@ skipping 4006 matching lines @@
 // TODO(benjhayden) Test that the shelf is shown for download() both with and
 // without a WebContents.
 
 void OnDangerPromptCreated(DownloadDangerPrompt* prompt) {
   prompt->InvokeActionForTesting(DownloadDangerPrompt::ACCEPT);
 }
 
 #if defined(OS_MACOSX)
 // Flakily triggers and assert on Mac.
 // http://crbug.com/180759
+#define MAYBE_DownloadExtensionTest_AcceptDanger DISABLED_DownloadExtensionTest_AcceptDanger
+#else
 #define MAYBE_DownloadExtensionTest_AcceptDanger DownloadExtensionTest_AcceptDanger
-#else
-#define MAYBE_DownloadExtensionTest_AcceptDanger DISABLED_DownloadExtensionTest_AcceptDanger
 #endif
 IN_PROC_BROWSER_TEST_F(DownloadExtensionTest,
                        MAYBE_DownloadExtensionTest_AcceptDanger) {
   // Download a file that will be marked dangerous; click the browser action
   // button; the browser action poup will call acceptDanger(); when the
   // DownloadDangerPrompt is created, pretend that the user clicks the Accept
   // button; wait until the download completes.
   LoadExtension("downloads_split");
   scoped_ptr<base::Value> result(RunFunctionAndReturnResult(
       new DownloadsDownloadFunction(),
@@ skipping 115 matching lines @@
   EXPECT_EQ(downloads::FILENAME_CONFLICT_ACTION_PROMPT, conflict_action);
   EXPECT_FALSE(warnings.empty());
   EXPECT_EQ(Warning::kDownloadFilenameConflict,
             warnings.begin()->warning_type());
   EXPECT_EQ("incumbent", warnings.begin()->extension_id());
 }
 
 }  // namespace extensions
 
 #endif  // http://crbug.com/3061144