run iwyu on base!

base/sys_info_posix.cc

Index: base/sys_info_posix.cc
diff --git a/base/sys_info_posix.cc b/base/sys_info_posix.cc
index 3f487e523deee7703ac0f440aa6592608cbe54c3..7761db676816d0dfefd3057ea233b426b3a67380 100644
--- a/base/sys_info_posix.cc
+++ b/base/sys_info_posix.cc
@@ -2,24 +2,22 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "base/sys_info.h"
-
-#include <errno.h>
-#include <string.h>
-#include <sys/param.h>
+#include <stddef.h>
 #include <sys/statvfs.h>
-#include <sys/sysctl.h>
 #include <sys/utsname.h>
 #include <unistd.h>
+#include <string>
+
+#include "base/file_path.h"
+#include "base/sys_info.h"
+#include "build/build_config.h"
 
 #if !defined(OS_MACOSX)
 #include <gdk/gdk.h>
 #endif
 
 #include "base/basictypes.h"
-#include "base/file_util.h"
 #include "base/logging.h"
-#include "base/utf_string_conversions.h"
 
 namespace base {