run iwyu on base!

base/md5.cc

 // The original file was copied from sqlite, and was in the public domain.
 // Modifications Copyright 2006 Google Inc. All Rights Reserved
 
 /*
  * This code implements the MD5 message-digest algorithm.
  * The algorithm is due to Ron Rivest.  This code was
  * written by Colin Plumb in 1993, no copyright is claimed.
  * This code is in the public domain; do with it what you wish.
  *
  * Equivalent code is available from RSA Data Security, Inc.
  * This code has been tested against that, and is equivalent,
  * except that you don't need to include two pages of legalese
  * with every copy.
  *
  * To compute the message digest of a chunk of bytes, declare an
  * MD5Context structure, pass it to MD5Init, call MD5Update as
  * needed on buffers full of bytes, and then call MD5Final, which
  * will fill a supplied 16-byte array with the digest.
  */
 
+#include <stddef.h>
+#include <string.h>
 #include <string>
 
+#include "base/basictypes.h"
 #include "base/md5.h"
 
-#include "base/basictypes.h"
-
 struct Context {
   uint32 buf[4];
   uint32 bits[2];
   unsigned char in[64];
 };
 
 /*
  * Note: this code is harmless on little-endian machines.
  */
 static void byteReverse(unsigned char *buf, unsigned longs){
@@ skipping 233 matching lines @@
   MD5Init(&ctx);
   MD5Update(&ctx, static_cast<const unsigned char*>(data), length);
   MD5Final(digest, &ctx);
 }
 
 std::string MD5String(const std::string& str) {
   MD5Digest digest;
   MD5Sum(str.data(), str.length(), &digest);
   return MD5DigestToBase16(digest);
 }