Fix preprocessor macro for flaky test (BrowserTest.FaviconChange).

chrome/browser/browser_browsertest.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 <string>
 
 #include "base/compiler_specific.h"
 #include "base/file_path.h"
 #include "base/sys_info.h"
 #include "base/utf_string_conversions.h"
@@ skipping 472 matching lines @@
   GURL url(test_server()->GetURL("files/onload_redirect_to_anchor.html"));
   GURL expected_favicon_url(test_server()->GetURL("files/test.png"));
 
   ui_test_utils::NavigateToURL(browser(), url);
 
   NavigationEntry* entry = browser()->GetSelectedTabContents()->
       controller().GetActiveEntry();
   EXPECT_EQ(expected_favicon_url.spec(), entry->favicon().url().spec());
 }
 
-#if defined(OS_MAC)
+#if defined(OS_MACOSX)
 // http://crbug.com/83828. On Mac 10.6, the failure rate is 14%
 #define MAYBE_FaviconChange FLAKY_FaviconChange
 #else
 #define MAYBE_FaviconChange FaviconChange
 #endif
 // Test that an icon can be changed from JS.
 IN_PROC_BROWSER_TEST_F(BrowserTest, MAYBE_FaviconChange) {
   static const FilePath::CharType* kFile =
       FILE_PATH_LITERAL("onload_change_favicon.html");
   GURL file_url(ui_test_utils::GetTestUrl(FilePath(FilePath::kCurrentDirectory),
@@ skipping 342 matching lines @@
 
   // The normal browser should now have four.
   EXPECT_EQ(4, browser()->tab_count());
 
   // Close the additional browsers.
   popup_browser->CloseAllTabs();
   app_browser->CloseAllTabs();
   app_popup_browser->CloseAllTabs();
 }
 #endif