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

crypto/hmac_mac.cc

Index: crypto/hmac_mac.cc
===================================================================
--- crypto/hmac_mac.cc	(revision 79901)
+++ crypto/hmac_mac.cc	(working copy)
@@ -1,14 +1,14 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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.
 
-#include "base/hmac.h"
+#include "crypto/hmac.h"
 
 #include <CommonCrypto/CommonHMAC.h>
 
 #include "base/logging.h"
 
-namespace base {
+namespace crypto {
 
 struct HMACPlatformData {
   std::string key_;
@@ -70,4 +70,4 @@
   return true;
 }
 
-}  // namespace base
+}  // namespace crypto