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

crypto/hmac.h

Index: crypto/hmac.h
===================================================================
--- crypto/hmac.h	(revision 79901)
+++ crypto/hmac.h	(working copy)
@@ -5,22 +5,21 @@
 // Utility class for calculating the HMAC for a given message. We currently
 // only support SHA1 for the hash algorithm, but this can be extended easily.
 
-#ifndef BASE_HMAC_H_
-#define BASE_HMAC_H_
+#ifndef CRYPTO_HMAC_H_
+#define CRYPTO_HMAC_H_
 #pragma once
 
 #include <string>
 
-#include "base/base_api.h"
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 
-namespace base {
+namespace crypto {
 
 // Simplify the interface and reduce includes by abstracting out the internals.
 struct HMACPlatformData;
 
-class BASE_API HMAC {
+class HMAC {
  public:
   // The set of supported hash functions. Extend as required.
   enum HashAlgorithm {
@@ -56,6 +55,6 @@
   DISALLOW_COPY_AND_ASSIGN(HMAC);
 };
 
-}  // namespace base
+}  // namespace crypto
 
-#endif  // BASE_HMAC_H_
+#endif  // CRYPTO_HMAC_H_