Move crypto files out of base, to a top level directory.

crypto/sha2.h

 // 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.
 
-#ifndef BASE_SHA2_H_
-#define BASE_SHA2_H_
+#ifndef CRYPTO_SHA2_H_
+#define CRYPTO_SHA2_H_
 #pragma once
 
 #include <string>
 
-#include "base/base_api.h"
-
-namespace base {
+namespace crypto {
 
 // These functions perform SHA-256 operations.
 //
 // Functions for SHA-384 and SHA-512 can be added when the need arises.
 
 enum {
   SHA256_LENGTH = 32  // length in bytes of a SHA-256 hash
 };
 
 // Computes the SHA-256 hash of the input string 'str' and stores the first
 // 'len' bytes of the hash in the output buffer 'output'.  If 'len' > 32,
 // only 32 bytes (the full hash) are stored in the 'output' buffer.
-BASE_API void SHA256HashString(const std::string& str,
-                               void* output, size_t len);
+void SHA256HashString(const std::string& str,
+                      void* output, size_t len);
 
 // Convenience version of the above that returns the result in a 32-byte
 // string.
-BASE_API std::string SHA256HashString(const std::string& str);
+std::string SHA256HashString(const std::string& str);
 
-}  // namespace base
+}  // namespace crypto
 
-#endif  // BASE_SHA2_H_
+#endif  // CRYPTO_SHA2_H_