POSIX: fix Mac build

(It worked on the try bot, what's different with the builders?)


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@9737 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/common/file_descriptor_set_unittest.cc b/chrome/common/file_descriptor_set_unittest.cc
index 061103a..ddbe6a6 100644
--- a/chrome/common/file_descriptor_set_unittest.cc
+++ b/chrome/common/file_descriptor_set_unittest.cc
@@ -4,6 +4,9 @@
 
 // This test is POSIX only.
 
+#include <unistd.h>
+#include <stdio.h>
+
 #include "base/basictypes.h"
 #include "chrome/common/file_descriptor_set_posix.h"
 #include "testing/gtest/include/gtest/gtest.h"