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

chrome/browser/download/download_util_unittest.cc

Index: chrome/browser/download/download_util_unittest.cc
diff --git a/chrome/browser/download/download_util_unittest.cc b/chrome/browser/download/download_util_unittest.cc
index d33ece9fed3dd83647709e429f38555f0e9ca268..98064e4eb10e4d350c94f3df3c220677c4ba3179 100644
--- a/chrome/browser/download/download_util_unittest.cc
+++ b/chrome/browser/download/download_util_unittest.cc
@@ -558,10 +558,18 @@ const struct {
 
   { 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",