run iwyu on base!

base/command_line.cc

Index: base/command_line.cc
diff --git a/base/command_line.cc b/base/command_line.cc
index 66b4437dcf171c62d86257de04b2c3996923f620..f251b9ae926522b8d70d146d49e2d2de5218fff6 100644
--- a/base/command_line.cc
+++ b/base/command_line.cc
@@ -2,27 +2,26 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <stdbool.h>
+#include <stddef.h>
+#include <map>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "base/basictypes.h"
 #include "base/command_line.h"
-
-#include <algorithm>
-
 #include "base/file_path.h"
-#include "base/file_util.h"
 #include "base/logging.h"
-#include "base/singleton.h"
+#include "base/string_piece.h"
 #include "base/string_split.h"
 #include "base/string_util.h"
-#include "base/sys_string_conversions.h"
-#include "base/utf_string_conversions.h"
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
-#include <windows.h>
 #include <shellapi.h>
+#include <windows.h>
 #elif defined(OS_POSIX)
-#include <limits.h>
-#include <stdlib.h>
-#include <unistd.h>
 #endif
 
 CommandLine* CommandLine::current_process_commandline_ = NULL;