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

crypto/sha2.h

Index: crypto/sha2.h
===================================================================
--- crypto/sha2.h	(revision 79901)
+++ crypto/sha2.h	(working copy)
@@ -2,16 +2,14 @@
 // 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 crypto {
 
-namespace base {
-
 // These functions perform SHA-256 operations.
 //
 // Functions for SHA-384 and SHA-512 can be added when the need arises.
@@ -23,13 +21,13 @@
 // 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_