run iwyu on base!

base/file_util_posix.cc

Index: base/file_util_posix.cc
diff --git a/base/file_util_posix.cc b/base/file_util_posix.cc
index 7e4c3a9709d37236265e827f3f3533ff19b4ceb0..9d98e4db54094d8a9b8c42ee15c24d748964f147 100644
--- a/base/file_util_posix.cc
+++ b/base/file_util_posix.cc
@@ -2,25 +2,27 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "base/file_util.h"
-
 #include <dirent.h>
-#include <errno.h>
-#include <fcntl.h>
 #include <fnmatch.h>
-#include <libgen.h>
-#include <limits.h>
+#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/dirent.h>
 #include <sys/errno.h>
+#include <sys/fcntl.h>
 #include <sys/mman.h>
-#include <sys/param.h>
 #include <sys/stat.h>
-#include <sys/time.h>
-#include <sys/types.h>
-#include <time.h>
+#include <sys/syslimits.h>
+#include <sys/unistd.h>
 #include <unistd.h>
+#include <stack>
+#include <string>
+#include <vector>
+
+#include "base/file_util.h"
+#include "base/platform_file.h"
+#include "build/build_config.h"
 
 #if defined(OS_MACOSX)
 #include <AvailabilityMacros.h>
@@ -28,19 +30,13 @@
 #include <glib.h>
 #endif
 
-#include <fstream>
-
 #include "base/basictypes.h"
 #include "base/eintr_wrapper.h"
 #include "base/file_path.h"
 #include "base/logging.h"
-#include "base/scoped_ptr.h"
-#include "base/singleton.h"
 #include "base/string_util.h"
-#include "base/sys_string_conversions.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/time.h"
-#include "base/utf_string_conversions.h"
 
 namespace file_util {