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

crypto/secure_hash.h

Index: crypto/secure_hash.h
===================================================================
--- crypto/secure_hash.h	(revision 79901)
+++ crypto/secure_hash.h	(working copy)
@@ -2,18 +2,17 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef BASE_CRYPTO_SECURE_HASH_H_
-#define BASE_CRYPTO_SECURE_HASH_H_
+#ifndef CRYPTO_SECURE_HASH_H_
+#define CRYPTO_SECURE_HASH_H_
 #pragma once
 
-#include "base/base_api.h"
 #include "base/basictypes.h"
 
-namespace base {
+namespace crypto {
 
 // A wrapper to calculate secure hashes incrementally, allowing to
 // be used when the full input is not known in advance.
-class BASE_API SecureHash {
+class SecureHash {
  public:
   enum Algorithm {
     SHA256,
@@ -32,6 +31,6 @@
   DISALLOW_COPY_AND_ASSIGN(SecureHash);
 };
 
-}  // namespace base
+}  // namespace crypto
 
-#endif  // BASE_CRYPTO_SECURE_HASH_H_
+#endif  // CRYPTO_SECURE_HASH_H_