iwyu: Cleanup in the following files:

base/command_line.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/command_line.h"
 
 #include <algorithm>
+#include <ostream>
 
+#include "base/basictypes.h"
 #include "base/file_path.h"
-#include "base/file_util.h"
 #include "base/logging.h"
-#include "base/memory/singleton.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>
-#elif defined(OS_POSIX)
-#include <limits.h>
-#include <stdlib.h>
-#include <unistd.h>
 #endif
 
 CommandLine* CommandLine::current_process_commandline_ = NULL;
 
 namespace {
 typedef CommandLine::StringType::value_type CharType;
 
 const CharType kSwitchTerminator[] = FILE_PATH_LITERAL("--");
 const CharType kSwitchValueSeparator[] = FILE_PATH_LITERAL("=");
 // Since we use a lazy match, make sure that longer versions (like "--") are
@@ skipping 443 matching lines @@
     }
   }
 
   if (args)
     LocalFree(args);
 }
 #endif
 
 CommandLine::CommandLine() {
 }