Keep only base/extractor.[cc|h].

base/security/md5.h

-// Copyright 2005-2009 Google Inc.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-// ========================================================================
-
-#ifndef OMAHA_COMMON_SECURITY_MD5_H__
-#define OMAHA_COMMON_SECURITY_MD5_H__
-
-#include <inttypes.h>
-#include "hash-internal.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif // __cplusplus
-
-typedef HASH_CTX MD5_CTX;
-
-void MD5_init(MD5_CTX* ctx);
-void MD5_update(MD5_CTX* ctx, const void* data, int len);
-const uint8_t* MD5_final(MD5_CTX* ctx);
-
-// Convenience method. Returns digest address.
-const uint8_t* MD5(const void* data, int len, uint8_t* digest);
-
-#define MD5_DIGEST_SIZE 16
-
-#ifdef __cplusplus
-}
-#endif // __cplusplus
-
-#endif  // OMAHA_COMMON_SECURITY_MD5_H__