Fix DownloadUtilTest on Mac. Not sure what causes the difference.

chrome/browser/download/download_util_unittest.cc

 // Copyright (c) 2010 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.
 
 #if defined(OS_POSIX) && !defined(OS_MACOSX)
 #include <locale.h>
 #endif
 
 #include "base/string_util.h"
 #include "chrome/browser/download/download_util.h"
@@ skipping 540 matching lines @@
 
   { FILE_PATH_LITERAL("/bar.html"),
     "image/png",
     FILE_PATH_LITERAL("/bar.html.png") },
   { FILE_PATH_LITERAL("/bar"),
     "image/png",
     FILE_PATH_LITERAL("/bar.png") },
 
   { FILE_PATH_LITERAL("/foo/bar.exe"),
     "text/html",
+#if defined(OS_MACOSX)
+    FILE_PATH_LITERAL("/foo/bar.exe.html") },
+#else
     FILE_PATH_LITERAL("/foo/bar.html") },
+#endif
   { FILE_PATH_LITERAL("/foo/bar.exe"),
     "image/gif",
+#if defined(OS_MACOSX)
+    FILE_PATH_LITERAL("/foo/bar.exe.gif") },
+#else
     FILE_PATH_LITERAL("/foo/bar.gif") },
+#endif
 
   { FILE_PATH_LITERAL("/foo/google.com"),
     "text/html",
     FILE_PATH_LITERAL("/foo/google.com.html") },
 
   { FILE_PATH_LITERAL("/foo/con.htm"),
     "text/html",
     FILE_PATH_LITERAL("/foo/con.htm") },
   { FILE_PATH_LITERAL("/foo/con"),
     "text/html",
     FILE_PATH_LITERAL("/foo/con.html") },
 #endif  // OS_WIN
 };
 
 TEST(DownloadUtilTest, GenerateSafeFileName) {
   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(kSafeFilenameCases); ++i) {
     FilePath path(kSafeFilenameCases[i].path);
     download_util::GenerateSafeFileName(kSafeFilenameCases[i].mime_type, &path);
     EXPECT_EQ(kSafeFilenameCases[i].expected_path, path.value());
   }
 }
 
 }  // namespace